{"already_in_source_count":0,"candidate_count":211,"cross_major":false,"cve_available":true,"cve_count":0,"cves":[],"duplicate_count":0,"excluded_count":0,"exclusions":[],"from_release":null,"groups":[{"age_days":4316,"build":"9.4.0","changes_count":189,"compatibility_count":22,"content_hash":"4bf0d615ef0747d209e3203da09a627422797869d050ea32ff76105ff7d53b8a","date":"2014-12-18","date_text":"2014-12-18","doc_git":"","doc_loaded_at":"2026-09-26T02:56:45.438944","entries":[{"also_in":[],"category":"compatibility","category_label":"Compatibility","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"60c26f468d55fdac09bb3c2b31186075","html":"\u003cp\u003e收紧对多维\u003ca href=\"/docs/9.4/arrays.html\" title=\"8.15. 数组\"\u003e数组\u003c/a\u003e输入的检查（Bruce Momjian）\u003c/p\u003e\n\u003cp\u003e此前，以单元素子数组开头的输入数组字符串后面可以包含多元素子数组，例如\u003ccode\u003e'{{1}, {2,3}}'::int[]\u003c/code\u003e会被接受。\u003c/p\u003e","id":"9.4.0-9c9c3dae50cc8251","identity_text":"Tighten checks for multidimensional array input (Bruce Momjian) Previously, an input array string that started with a single-element sub-array could later contain multi-element sub-arrays, e.g. '{{1}, {2,3}}'::int[] would be accepted.","part":"migration","patch_ids":[],"related_changes":[],"relations":[],"section":"兼容性","section_path":["兼容性"],"source_commits":[],"source_entry_id":"9.4.0/migration/001","source_hash":"133bbe7b40ddca0f20c5e4c77fc3ddaba5750aa1c5c7a287d786cc5b59615faf","source_url":"/docs/release/9.4.0/#id-1.11.6.31.4","statement_hash":"d1f8be133565e794bd60454b2e56e55545df78b4cbc8d96b008e4be38e7b51e6","text":"收紧对多维数组输入的检查（Bruce Momjian） 此前，以单元素子数组开头的输入数组字符串后面可以包含多元素子数组，例如'{{1}, {2,3}}'::int[]会被接受。","title":"收紧对多维数组输入的检查","variants":[],"version":"9.4.0"},{"also_in":[],"category":"compatibility","category_label":"Compatibility","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"83a0e27304ddf64b13db7541664d195b","html":"\u003cp\u003e在将\u003ccode\u003edate\u003c/code\u003e、\u003ccode\u003etimestamp\u003c/code\u003e或\u003ccode\u003etimestamptz\u003c/code\u003e类型的值转换为\u003ca href=\"/docs/9.4/datatype-json.html\" title=\"8.14. JSON 类型\"\u003e\u003ccode\u003eJSON\u003c/code\u003e\u003c/a\u003e时，按符合 ISO 8601 的格式呈现这些值（Andrew Dunstan）\u003c/p\u003e\n\u003cp\u003e此前这些值按当前\u003ca href=\"/docs/9.4/runtime-config-client.html#GUC-DATESTYLE\"\u003eDateStyle\u003c/a\u003e设置呈现；但许多 JSON 处理器要求时间戳为 ISO 8601 格式。如有需要，可以在把日期时间值传给 JSON 转换函数之前显式转换为\u003ccode\u003etext\u003c/code\u003e来获得以前的行为。\u003c/p\u003e","id":"9.4.0-011e24aa31ef8425","identity_text":"When converting values of type date, timestamp or timestamptz to JSON, render the values in a format compliant with ISO 8601 (Andrew Dunstan) Previously such values were rendered according to the current guc-datestyle setting; but many JSON processors require timestamps to be in ISO 8601 format. If necessary, the previous behavior can be obtained by explicitly casting the datetime value to text before passing it to the JSON conversion function.","part":"migration","patch_ids":[],"related_changes":[],"relations":[],"section":"兼容性","section_path":["兼容性"],"source_commits":[],"source_entry_id":"9.4.0/migration/002","source_hash":"8c29904c978dbd9f2f0a80c905eec0fda25597911514d709a4242d0ca31b03f6","source_url":"/docs/release/9.4.0/#id-1.11.6.31.4","statement_hash":"961368c175c8f44583211dbf8c0734eebb10bbb115d288db1c3876cc058d7dc4","text":"在将date、timestamp或timestamptz类型的值转换为JSON时，按符合 ISO 8601 的格式呈现这些值（Andrew Dunstan） 此前这些值按当前DateStyle设置呈现；但许多 JSON 处理器要求时间戳为 ISO 8601 格式。如有需要，可以在把日期时间值传给 JSON 转换函数之前显式转换为text来获得以前的行为。","title":"在将date、timestamp或timestamptz类型的值转换为JSON时，按符合 ISO 8601 的格式呈现这些值","variants":[],"version":"9.4.0"},{"also_in":[],"category":"compatibility","category_label":"Compatibility","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"d19a9e07bbb6c7f27251cdcec5ad0e8c","html":"\u003cp\u003e\u003ca href=\"/docs/9.4/functions-json.html#FUNCTIONS-JSON-OP-TABLE\" title=\"表 9.40. json 和 jsonb 操作符\"\u003e\u003ccode\u003ejson\u003c/code\u003e\u003ccode\u003e#\u0026gt;\u003c/code\u003e\u003ccode\u003etext[]\u003c/code\u003e\u003c/a\u003e路径提取操作符现在在数组为空时返回其左操作数输入而非 NULL（Tom Lane）\u003c/p\u003e\n\u003cp\u003e这与该操作表示对简单字段/元素提取操作符\u003ccode\u003e-\u0026gt;\u003c/code\u003e应用零次的概念一致。类似地，带空数组的\u003ccode\u003ejson\u003c/code\u003e\u003ccode\u003e#\u0026gt;\u0026gt;\u003c/code\u003e\u003ccode\u003etext[]\u003c/code\u003e只是把其左操作数输入强制转换为文本。\u003c/p\u003e","id":"9.4.0-895829ecf3121d53","identity_text":"The json #\u003e text[] path extraction operator now returns its lefthand input, not NULL, if the array is empty (Tom Lane) This is consistent with the notion that this represents zero applications of the simple field/element extraction operator -\u003e. Similarly, json #\u003e\u003e text[] with an empty array merely coerces its lefthand input to text.","part":"migration","patch_ids":[],"related_changes":[],"relations":[],"section":"兼容性","section_path":["兼容性"],"source_commits":[],"source_entry_id":"9.4.0/migration/003","source_hash":"e020e93d19ee194dd750ab2e91776d02b4c8a3a51c20788588291a4f7a2cb4ef","source_url":"/docs/release/9.4.0/#id-1.11.6.31.4","statement_hash":"89c7f41ac942d3a1f303f25813dc538bb9df8775b503a887c2b8df1d1dc6d0d6","text":"json#\u003etext[]路径提取操作符现在在数组为空时返回其左操作数输入而非 NULL（Tom Lane） 这与该操作表示对简单字段/元素提取操作符-\u003e应用零次的概念一致。类似地，带空数组的json#\u003e\u003etext[]只是把其左操作数输入强制转换为文本。","title":"json#\u003etext[]路径提取操作符现在在数组为空时返回其左操作数输入而非 NULL","variants":[],"version":"9.4.0"},{"also_in":[],"category":"compatibility","category_label":"Compatibility","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"f84a57ba6c40990ff398ddc9e7f831f9","html":"\u003cp\u003e\u003ca href=\"/docs/9.4/functions-json.html#FUNCTIONS-JSON-OP-TABLE\" title=\"表 9.40. json 和 jsonb 操作符\"\u003e\u003ccode\u003eJSON\u003c/code\u003e字段/元素/路径提取操作符\u003c/a\u003e的极端情况现在返回 NULL 而不是抛出错误（Tom Lane）\u003c/p\u003e\n\u003cp\u003e例如，对 JSON 数组应用字段提取现在得到 NULL 而不是错误。这更一致（因为诸如字段不存在等可比情况此前就已返回 NULL），而且使创建使用这些操作符的表达式索引变得安全，因为它们现在不会对任何有效的 JSON 输入抛出错误。\u003c/p\u003e","id":"9.4.0-73a24096294496ee","identity_text":"Corner cases in the JSON field/element/path extraction operators now return NULL rather than raising an error (Tom Lane) For example, applying field extraction to a JSON array now yields NULL not an error. This is more consistent (since some comparable cases such as no-such-field already returned NULL), and it makes it safe to create expression indexes that use these operators, since they will now not throw errors for any valid JSON input.","part":"migration","patch_ids":[],"related_changes":[],"relations":[],"section":"兼容性","section_path":["兼容性"],"source_commits":[],"source_entry_id":"9.4.0/migration/004","source_hash":"035e324bfb1627108bf3610418d1177e965416a36c2c6f351e1f10fae442bac7","source_url":"/docs/release/9.4.0/#id-1.11.6.31.4","statement_hash":"0e69d26c1a4417a7f5f97bda5e5056bfe3558658fc32c2abbcd61f5ab36e5f66","text":"JSON字段/元素/路径提取操作符的极端情况现在返回 NULL 而不是抛出错误（Tom Lane） 例如，对 JSON 数组应用字段提取现在得到 NULL 而不是错误。这更一致（因为诸如字段不存在等可比情况此前就已返回 NULL），而且使创建使用这些操作符的表达式索引变得安全，因为它们现在不会对任何有效的 JSON 输入抛出错误。","title":"JSON字段/元素/路径提取操作符的极端情况现在返回 NULL 而不是抛出错误","variants":[],"version":"9.4.0"},{"also_in":[],"category":"compatibility","category_label":"Compatibility","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"b7fc09c0fc7f34184cb8710bb70b3602","html":"\u003cp\u003e使\u003ca href=\"/docs/9.4/functions-formatting.html#FUNCTIONS-FORMATTING-TABLE\" title=\"表 9.21. 格式化函数\"\u003e\u003ccode\u003eto_timestamp()\u003c/code\u003e\u003c/a\u003e和\u003ccode\u003eto_date()\u003c/code\u003e格式串中连续的空白字符消费输入串中相应数量的字符（无论是否空白），然后在非\u003ccode\u003eFX\u003c/code\u003e模式下视情况消费相邻空白（Jeevan Chalke）\u003c/p\u003e\n\u003cp\u003e此前，非\u003ccode\u003eFX\u003c/code\u003e格式串中的连续空白字符表现得像单个空白字符，并消费输入串中所有相邻空白。例如，此前三个空格的格式串在\u003ccode\u003e' 12'\u003c/code\u003e中只会消费第一个空格，但现在会消费全部三个字符。\u003c/p\u003e","id":"9.4.0-4d17fdbcbee28c72","identity_text":"Cause consecutive whitespace in to_timestamp() and to_date() format strings to consume a corresponding number of characters in the input string (whitespace or not), then conditionally consume adjacent whitespace, if not in FX mode (Jeevan Chalke) Previously, consecutive whitespace characters in a non-FX format string behaved like a single whitespace character and consumed all adjacent whitespace in the input string. For example, previously a format string of three spaces would consume only the first space in ' 12', but it will now consume all three characters.","part":"migration","patch_ids":[],"related_changes":[],"relations":[],"section":"兼容性","section_path":["兼容性"],"source_commits":[],"source_entry_id":"9.4.0/migration/005","source_hash":"e8a6886b775bfda296fa3be0e174f045a23cca64828acb92f202ac7d0fb38c7f","source_url":"/docs/release/9.4.0/#id-1.11.6.31.4","statement_hash":"bb7a04b5a5ae8f9b77ed6b16f7af5df1b71c5f17ec693917bb3af11b483d11f9","text":"使to_timestamp()和to_date()格式串中连续的空白字符消费输入串中相应数量的字符（无论是否空白），然后在非FX模式下视情况消费相邻空白（Jeevan Chalke） 此前，非FX格式串中的连续空白字符表现得像单个空白字符，并消费输入串中所有相邻空白。例如，此前三个空格的格式串在' 12'中只会消费第一个空格，但现在会消费全部三个字符。","title":"使to_timestamp()和to_date()格式串中连续的空白字符消费输入串中相应数量的字符（无论是否空白），然后在非FX模式下视情况消费相邻空白","variants":[],"version":"9.4.0"},{"also_in":[],"category":"compatibility","category_label":"Compatibility","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"a89bc1d88493323b5b71f7a5fbd6f305","html":"\u003cp\u003e修复\u003ca href=\"/docs/9.4/functions-textsearch.html#TEXTSEARCH-FUNCTIONS-TABLE\" title=\"表 9.38. 文本搜索函数\"\u003e\u003ccode\u003ets_rank_cd()\u003c/code\u003e\u003c/a\u003e使其忽略已去除位置信息的词位（Alex Hill）\u003c/p\u003e\n\u003cp\u003e此前，已去除位置信息的词位被当作具有默认位置处理，产生用处可疑的排名。\u003c/p\u003e","id":"9.4.0-1ee5735c19d09fe6","identity_text":"Fix ts_rank_cd() to ignore stripped lexemes (Alex Hill) Previously, stripped lexemes were treated as if they had a default location, producing a rank of dubious usefulness.","part":"migration","patch_ids":[],"related_changes":[],"relations":[],"section":"兼容性","section_path":["兼容性"],"source_commits":[],"source_entry_id":"9.4.0/migration/006","source_hash":"5d9fc639c50022b39c74b4a11b90c53de38f26d19904207830cfac5ef81a716b","source_url":"/docs/release/9.4.0/#id-1.11.6.31.4","statement_hash":"355356bbc0ee85a6577759812b944c194e5c9a047a58a54a7bf97a799ef45c13","text":"修复ts_rank_cd()使其忽略已去除位置信息的词位（Alex Hill） 此前，已去除位置信息的词位被当作具有默认位置处理，产生用处可疑的排名。","title":"修复ts_rank_cd()使其忽略已去除位置信息的词位","variants":[],"version":"9.4.0"},{"also_in":[],"category":"compatibility","category_label":"Compatibility","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"9decfa50be75922933d62717781ea49a","html":"\u003cp\u003e对于声明为接受\u003ca href=\"/docs/9.4/xfunc-sql.html#XFUNC-SQL-VARIADIC-FUNCTIONS\" title=\"35.4.5. 带有可变数量参数的SQL函数\"\u003e\u003ccode\u003eVARIADIC \"any\"\u003c/code\u003e\u003c/a\u003e的函数，标记为\u003ccode\u003eVARIADIC\u003c/code\u003e的实际参数必须是可确定数组类型（Pavel Stehule）\u003c/p\u003e\n\u003cp\u003e此类参数不能再写成不带修饰的字符串字面量或\u003ccode\u003eNULL\u003c/code\u003e；现在需要转换为适当的数组数据类型。注意这不影响未标记\u003ccode\u003eVARIADIC\u003c/code\u003e的参数。\u003c/p\u003e","id":"9.4.0-2004ec7e3d85b01c","identity_text":"For functions declared to take VARIADIC \"any\", an actual parameter marked as VARIADIC must be of a determinable array type (Pavel Stehule) Such parameters can no longer be written as an undecorated string literal or NULL; a cast to an appropriate array data type will now be required. Note that this does not affect parameters not marked VARIADIC.","part":"migration","patch_ids":[],"related_changes":[],"relations":[],"section":"兼容性","section_path":["兼容性"],"source_commits":[],"source_entry_id":"9.4.0/migration/007","source_hash":"daf4e376b4bef2992ac9078eef7d184082db3f224ba34cde869af4d5693676c3","source_url":"/docs/release/9.4.0/#id-1.11.6.31.4","statement_hash":"6df0b7ef03d4c87362d79f470a2b5dba98a8ba3fed54674699c15033bcc83722","text":"对于声明为接受VARIADIC \"any\"的函数，标记为VARIADIC的实际参数必须是可确定数组类型（Pavel Stehule） 此类参数不能再写成不带修饰的字符串字面量或NULL；现在需要转换为适当的数组数据类型。注意这不影响未标记VARIADIC的参数。","title":"对于声明为接受VARIADIC \"any\"的函数，标记为VARIADIC的实际参数必须是可确定数组类型","variants":[],"version":"9.4.0"},{"also_in":[],"category":"compatibility","category_label":"Compatibility","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"7b9174450ed524274da417d808bb21c0","html":"\u003cp\u003e确保整行变量向关注组合参数内列名的函数暴露预期的列名（Tom Lane）\u003c/p\u003e\n\u003cp\u003e现在，像\u003ccode\u003erow_to_json(tab.*)\u003c/code\u003e这样的结构总是输出与调用处表\u003ccode\u003etab\u003c/code\u003e可见的列别名匹配的列名。在以前的发行版中，输出的列名有时是表的实际列名，而不管查询中指派了什么别名。\u003c/p\u003e","id":"9.4.0-1aa30827011bf0f9","identity_text":"Ensure that whole-row variables expose the expected column names to functions that pay attention to column names within composite arguments (Tom Lane) Constructs like row_to_json(tab.*) now always emit column names that match the column aliases visible for table tab at the point of the call. In previous releases the emitted column names would sometimes be the table's actual column names regardless of any aliases assigned in the query.","part":"migration","patch_ids":[],"related_changes":[],"relations":[],"section":"兼容性","section_path":["兼容性"],"source_commits":[],"source_entry_id":"9.4.0/migration/008","source_hash":"9d7b7d9fba8d898afd43302dae2bc1a706339aae46870cf1574e6863f3e75c9e","source_url":"/docs/release/9.4.0/#id-1.11.6.31.4","statement_hash":"69c9d250a0f81be3948ccf7b41fdc1685aa1afe8604c64c48529de71a8151560","text":"确保整行变量向关注组合参数内列名的函数暴露预期的列名（Tom Lane） 现在，像row_to_json(tab.*)这样的结构总是输出与调用处表tab可见的列别名匹配的列名。在以前的发行版中，输出的列名有时是表的实际列名，而不管查询中指派了什么别名。","title":"确保整行变量向关注组合参数内列名的函数暴露预期的列名","variants":[],"version":"9.4.0"},{"also_in":[],"category":"compatibility","category_label":"Compatibility","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"40d413ef563b3376e65c860f75979049","html":"\u003cp\u003e\u003ca href=\"/docs/9.4/sql-discard.html\" title=\"DISCARD\"\u003e\u003cspan\u003eDISCARD\u003c/span\u003e\u003c/a\u003e现在还会丢弃与序列相关的状态（Fabrízio de Royes Mello、Robert Haas）\u003c/p\u003e","id":"9.4.0-a3a52689b3eccdb2","identity_text":"sql-discard now also discards sequence-related state (Fabrízio de Royes Mello, Robert Haas)","part":"migration","patch_ids":[],"related_changes":[],"relations":[],"section":"兼容性","section_path":["兼容性"],"source_commits":[],"source_entry_id":"9.4.0/migration/009","source_hash":"c17009c08f738967471c5d7dc24401d0f2366137453729f36f30380ee166a176","source_url":"/docs/release/9.4.0/#id-1.11.6.31.4","statement_hash":"68063a9a438a7255dd772a103dc8b0ed864b87aa9d6cb978088a057631290e17","text":"DISCARD现在还会丢弃与序列相关的状态（Fabrízio de Royes Mello、Robert Haas）","title":"DISCARD现在还会丢弃与序列相关的状态","variants":[],"version":"9.4.0"},{"also_in":[],"category":"compatibility","category_label":"Compatibility","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"3d1751975e55ba1a65beffcd538b7ce4","html":"\u003cp\u003e将\u003ca href=\"/docs/9.4/sql-explain.html\" title=\"EXPLAIN\"\u003e\u003ccode\u003eEXPLAIN ANALYZE\u003c/code\u003e\u003c/a\u003e输出中的\u003cspan\u003e“\u003cspan\u003etotal runtime\u003c/span\u003e”\u003c/span\u003e更名为\u003cspan\u003e“\u003cspan\u003eexecution time\u003c/span\u003e”\u003c/span\u003e（Tom Lane）\u003c/p\u003e\n\u003cp\u003e既然规划时间也一并报告，以前的名称容易引起混淆。\u003c/p\u003e","id":"9.4.0-4c372277a90e2896","identity_text":"Rename EXPLAIN ANALYZE's total runtime output to execution time (Tom Lane) Now that planning time is also reported, the previous name was confusing.","part":"migration","patch_ids":[],"related_changes":[],"relations":[],"section":"兼容性","section_path":["兼容性"],"source_commits":[],"source_entry_id":"9.4.0/migration/010","source_hash":"dc629837c8ee2b2ebe262dc47ffabe47e38f9f6f8899f737db6431027e589d8d","source_url":"/docs/release/9.4.0/#id-1.11.6.31.4","statement_hash":"1f261d6bb48070c42a0bbaa63d26e668dac58ed58b30833b16281e81c3ba1b3e","text":"将EXPLAIN ANALYZE输出中的“total runtime”更名为“execution time”（Tom Lane） 既然规划时间也一并报告，以前的名称容易引起混淆。","title":"将EXPLAIN ANALYZE输出中的“total runtime”更名为“execution time”","variants":[],"version":"9.4.0"},{"also_in":[],"category":"compatibility","category_label":"Compatibility","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"6be7f212bef502a3f1be15cdb7d52d90","html":"\u003cp\u003e\u003ca href=\"/docs/9.4/sql-show.html\" title=\"SHOW\"\u003e\u003ccode\u003eSHOW TIME ZONE\u003c/code\u003e\u003c/a\u003e现在以\u003cacronym\u003ePOSIX\u003c/acronym\u003e时区格式输出简单的数字 UTC 偏移（Tom Lane）\u003c/p\u003e\n\u003cp\u003e此前，此类时区设置显示为\u003ca href=\"/docs/9.4/datatype-datetime.html#DATATYPE-INTERVAL-OUTPUT\" title=\"8.5.5. 间隔输出\"\u003e\u003ccode\u003einterval\u003c/code\u003e\u003c/a\u003e值。作为简单字符串传递时，新的输出能被\u003ccode\u003eSET TIME ZONE\u003c/code\u003e正确解释，而旧输出需要特殊处理才能被正确重新解析。\u003c/p\u003e","id":"9.4.0-625ccb9410adec1c","identity_text":"SHOW TIME ZONE now outputs simple numeric UTC offsets in POSIX timezone format (Tom Lane) Previously, such timezone settings were displayed as interval values. The new output is properly interpreted by SET TIME ZONE when passed as a simple string, whereas the old output required special treatment to be re-parsed correctly.","part":"migration","patch_ids":[],"related_changes":[],"relations":[],"section":"兼容性","section_path":["兼容性"],"source_commits":[],"source_entry_id":"9.4.0/migration/011","source_hash":"89d7d2870ab0e8f708b9278543c0262b711f063b9329d61c94ae892ce11a49f8","source_url":"/docs/release/9.4.0/#id-1.11.6.31.4","statement_hash":"5610076ada38eeca7f24dde8a9dd2866c9c339ddc4bb6cef2180f2ca87a42048","text":"SHOW TIME ZONE现在以POSIX时区格式输出简单的数字 UTC 偏移（Tom Lane） 此前，此类时区设置显示为interval值。作为简单字符串传递时，新的输出能被SET TIME ZONE正确解释，而旧输出需要特殊处理才能被正确重新解析。","title":"SHOW TIME ZONE现在以POSIX时区格式输出简单的数字 UTC 偏移","variants":[],"version":"9.4.0"},{"also_in":[],"category":"compatibility","category_label":"Compatibility","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"69f1d0363b8850dd292d048f67121e0f","html":"\u003cp\u003e支持更新外部表的外部数据包装器必须考虑可能存在的\u003ccode\u003eAFTER ROW\u003c/code\u003e触发器（Noah Misch）\u003c/p\u003e\n\u003cp\u003e当存在\u003ccode\u003eAFTER ROW\u003c/code\u003e触发器时，更新操作必须返回表的所有列，因为触发器可能检查其中任意或全部列。此前外部表从不带触发器，因此 FDW 可能优化掉对\u003ccode\u003eRETURNING\u003c/code\u003e子句（若有）中未提及列的获取。\u003c/p\u003e","id":"9.4.0-e79a81d649da43dc","identity_text":"Foreign data wrappers that support updating foreign tables must consider the possible presence of AFTER ROW triggers (Noah Misch) When an AFTER ROW trigger is present, all columns of the table must be returned by updating actions, since the trigger might inspect any or all of them. Previously, foreign tables never had triggers, so the FDW might optimize away fetching columns not mentioned in the RETURNING clause (if any).","part":"migration","patch_ids":[],"related_changes":[],"relations":[],"section":"兼容性","section_path":["兼容性"],"source_commits":[],"source_entry_id":"9.4.0/migration/012","source_hash":"5a7b370bdaa89e677922c7fbf2ef824f9fb3e501392b65559a6a269c0593246e","source_url":"/docs/release/9.4.0/#id-1.11.6.31.4","statement_hash":"cb58a49fe84dfcfb6cc12c38baf94e9802bfd0cad091dadda2b944e84d7ff1fa","text":"支持更新外部表的外部数据包装器必须考虑可能存在的AFTER ROW触发器（Noah Misch） 当存在AFTER ROW触发器时，更新操作必须返回表的所有列，因为触发器可能检查其中任意或全部列。此前外部表从不带触发器，因此 FDW 可能优化掉对RETURNING子句（若有）中未提及列的获取。","title":"支持更新外部表的外部数据包装器必须考虑可能存在的AFTER ROW触发器","variants":[],"version":"9.4.0"},{"also_in":[],"category":"compatibility","category_label":"Compatibility","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"a8d48fe017675fcfa19b7dd16491d900","html":"\u003cp\u003e阻止\u003ca href=\"/docs/9.4/ddl-constraints.html#DDL-CONSTRAINTS-CHECK-CONSTRAINTS\" title=\"5.3.1. 检查约束\"\u003e\u003ccode\u003eCHECK\u003c/code\u003e\u003c/a\u003e约束引用系统列，\u003ccode\u003etableoid\u003c/code\u003e除外（Amit Kapila）\u003c/p\u003e\n\u003cp\u003e此前此类检查约束是被允许的，但它们常常在还原期间导致错误。\u003c/p\u003e","id":"9.4.0-2c1e9b730cdc35ed","identity_text":"Prevent CHECK constraints from referencing system columns, except tableoid (Amit Kapila) Previously such check constraints were allowed, but they would often cause errors during restores.","part":"migration","patch_ids":[],"related_changes":[],"relations":[],"section":"兼容性","section_path":["兼容性"],"source_commits":[],"source_entry_id":"9.4.0/migration/013","source_hash":"29fed6f189a72c24e85ada0cc4cd0f16b403e923cdd0eaa0a2fa81e4b20c9e6b","source_url":"/docs/release/9.4.0/#id-1.11.6.31.4","statement_hash":"a8881da2f282c478313e6680a2f91fc6572ea1359c67abd1cf115cc5d8c5d513","text":"阻止CHECK约束引用系统列，tableoid除外（Amit Kapila） 此前此类检查约束是被允许的，但它们常常在还原期间导致错误。","title":"阻止CHECK约束引用系统列，tableoid除外","variants":[],"version":"9.4.0"},{"also_in":[],"category":"compatibility","category_label":"Compatibility","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"2e5d7aa302315bc05e8b897097175ced","html":"\u003cp\u003e在指定了多个目标参数时，使用最后指定的\u003ca href=\"/docs/9.4/recovery-target-settings.html\" title=\"26.2. 恢复目标设置\"\u003e恢复目标参数\u003c/a\u003e（Heikki Linnakangas）\u003c/p\u003e\n\u003cp\u003e此前，\u003ccode\u003erecovery_target_\u003cem\u003e\u003ccode\u003exxx\u003c/code\u003e\u003c/em\u003e\u003c/code\u003e参数之间存在未写入文档的优先顺序。\u003c/p\u003e","id":"9.4.0-db9fabd6dd88e212","identity_text":"Use the last specified recovery target parameter if multiple target parameters are specified (Heikki Linnakangas) Previously, there was an undocumented precedence order among the recovery_target_xxx parameters.","part":"migration","patch_ids":[],"related_changes":[],"relations":[],"section":"兼容性","section_path":["兼容性"],"source_commits":[],"source_entry_id":"9.4.0/migration/014","source_hash":"be844843a12369fb1c2618b52df22f4ccccf1b88e3a7c76f3e675e1ca6f514ef","source_url":"/docs/release/9.4.0/#id-1.11.6.31.4","statement_hash":"3b4972194cf290f6d7ee06bc11d1b13bef964e3d550d66214f635c240178c10b","text":"在指定了多个目标参数时，使用最后指定的恢复目标参数（Heikki Linnakangas） 此前，recovery_target_xxx参数之间存在未写入文档的优先顺序。","title":"在指定了多个目标参数时，使用最后指定的恢复目标参数","variants":[],"version":"9.4.0"},{"also_in":[],"category":"compatibility","category_label":"Compatibility","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"f7492d5286f9661bee0a916fbe4ad5a8","html":"\u003cp\u003e在 Windows 上自动保留用户提供的命令串中的引号（Heikki Linnakangas）\u003c/p\u003e\n\u003cp\u003e自行处理引号保留的用户命令可能需要调整。\u003ca href=\"/docs/9.4/runtime-config-wal.html#GUC-ARCHIVE-COMMAND\"\u003earchive_command\u003c/a\u003e、\u003ca href=\"/docs/9.4/recovery-config.html#RESTORE-COMMAND\"\u003erestore_command\u003c/a\u003e以及\u003ca href=\"/docs/9.4/sql-copy.html\" title=\"COPY\"\u003e\u003ccode\u003eCOPY TO/FROM PROGRAM\u003c/code\u003e\u003c/a\u003e中使用的命令很可能受此影响。\u003c/p\u003e","id":"9.4.0-cee7c1e9cd931833","identity_text":"On Windows, automatically preserve quotes in command strings supplied by the user (Heikki Linnakangas) User commands that did their own quote preservation might need adjustment. This is likely to be an issue for commands used in guc-archive-command , restore-command , and COPY TO/FROM PROGRAM.","part":"migration","patch_ids":[],"related_changes":[],"relations":[],"section":"兼容性","section_path":["兼容性"],"source_commits":[],"source_entry_id":"9.4.0/migration/015","source_hash":"00251af05f5b7ecfe6ce7d9fa20cef4d16f5d8084f899602d4b74aaa294e93c8","source_url":"/docs/release/9.4.0/#id-1.11.6.31.4","statement_hash":"9e9f60e65b444ee713581ace317453022d908038c62b0d27188a635a26ef3b86","text":"在 Windows 上自动保留用户提供的命令串中的引号（Heikki Linnakangas） 自行处理引号保留的用户命令可能需要调整。archive_command、restore_command以及COPY TO/FROM PROGRAM中使用的命令很可能受此影响。","title":"在 Windows 上自动保留用户提供的命令串中的引号","variants":[],"version":"9.4.0"},{"also_in":[],"category":"compatibility","category_label":"Compatibility","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"3ee913c526ecd1cf4f5c22ad50d08146","html":"\u003cp\u003e移除目录列\u003ca href=\"/docs/9.4/catalog-pg-class.html\" title=\"48.11. pg_class\"\u003e\u003ccode\u003epg_class.reltoastidxid\u003c/code\u003e\u003c/a\u003e（Michael Paquier）\u003c/p\u003e","id":"9.4.0-ccd1163f69272984","identity_text":"Remove catalog column pg_class.reltoastidxid (Michael Paquier)","part":"migration","patch_ids":[],"related_changes":[],"relations":[],"section":"兼容性","section_path":["兼容性"],"source_commits":[],"source_entry_id":"9.4.0/migration/016","source_hash":"deba8ae24821ae2f7e2e3445bd5cf6a039cb3ce3fb249df248bf6aac085257df","source_url":"/docs/release/9.4.0/#id-1.11.6.31.4","statement_hash":"f6956ba8fc4fa45bd893fa9d3e77b382e47accd3dcfb0fc1756e1ff31b262c50","text":"移除目录列pg_class.reltoastidxid（Michael Paquier）","title":"移除目录列pg_class.reltoastidxid","variants":[],"version":"9.4.0"},{"also_in":[],"category":"compatibility","category_label":"Compatibility","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"16de8532d353984c7abbfd08c70a4d30","html":"\u003cp\u003e移除目录列\u003ca href=\"/docs/9.4/catalog-pg-rewrite.html\" title=\"48.38. pg_rewrite\"\u003e\u003ccode\u003epg_rewrite.ev_attr\u003c/code\u003e\u003c/a\u003e（Kevin Grittner）\u003c/p\u003e\n\u003cp\u003e逐列规则自\u003cspan\u003ePostgreSQL\u003c/span\u003e 7.3 起就不再支持。\u003c/p\u003e","id":"9.4.0-97045112e8c91420","identity_text":"Remove catalog column pg_rewrite.ev_attr (Kevin Grittner) Per-column rules have not been supported since PostgreSQL 7.3.","part":"migration","patch_ids":[],"related_changes":[],"relations":[],"section":"兼容性","section_path":["兼容性"],"source_commits":[],"source_entry_id":"9.4.0/migration/017","source_hash":"87a1deca2640259e7dfe1ac164cd16fb8ce83920a9470800492c148e3a9f835d","source_url":"/docs/release/9.4.0/#id-1.11.6.31.4","statement_hash":"d3fb7b06f28f5c295b1360e94b116ed4b59f7a11ec458870bdb1d398b1f91fad","text":"移除目录列pg_rewrite.ev_attr（Kevin Grittner） 逐列规则自PostgreSQL 7.3 起就不再支持。","title":"移除目录列pg_rewrite.ev_attr","variants":[],"version":"9.4.0"},{"also_in":[],"category":"compatibility","category_label":"Compatibility","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"d104d9250140abf93fc780f8ecea28a9","html":"\u003cp\u003e移除对\u003cspan\u003eKerberos\u003c/span\u003e认证的原生支持（\u003ccode\u003e--with-krb5\u003c/code\u003e等）（Magnus Hagander）\u003c/p\u003e\n\u003cp\u003e使用\u003cspan\u003eKerberos\u003c/span\u003e认证的受支持方式是通过\u003cacronym\u003eGSSAPI\u003c/acronym\u003e。原生代码自\u003cspan\u003ePostgreSQL\u003c/span\u003e 8.3 起已被弃用。\u003c/p\u003e","id":"9.4.0-d3c08c6899d47b4b","identity_text":"Remove native support for Kerberos authentication (--with-krb5, etc) (Magnus Hagander) The supported way to use Kerberos authentication is with GSSAPI. The native code has been deprecated since PostgreSQL 8.3.","part":"migration","patch_ids":[],"related_changes":[],"relations":[],"section":"兼容性","section_path":["兼容性"],"source_commits":[],"source_entry_id":"9.4.0/migration/018","source_hash":"33965a1371f87fd99b508e58688412e5370cb11b797f7c9a7f5398e15b72d98f","source_url":"/docs/release/9.4.0/#id-1.11.6.31.4","statement_hash":"5c65047364a67f7471c23c6bd7a4687292885a2f2034cc76aff29da8ff6fd782","text":"移除对Kerberos认证的原生支持（--with-krb5等）（Magnus Hagander） 使用Kerberos认证的受支持方式是通过GSSAPI。原生代码自PostgreSQL 8.3 起已被弃用。","title":"移除对Kerberos认证的原生支持（--with-krb5等）","variants":[],"version":"9.4.0"},{"also_in":[],"category":"compatibility","category_label":"Compatibility","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"676dd31372ea0b36d90c1946ddb323fa","html":"\u003cp\u003e在\u003cspan\u003ePL/Python\u003c/span\u003e中，像处理底层数组类型一样处理域于数组的类型（Rodolfo Campero）\u003c/p\u003e\n\u003cp\u003e此前此类值被当作字符串处理。\u003c/p\u003e","id":"9.4.0-11184aac7c07aa80","identity_text":"In PL/Python, handle domains over arrays like the underlying array type (Rodolfo Campero) Previously such values were treated as strings.","part":"migration","patch_ids":[],"related_changes":[],"relations":[],"section":"兼容性","section_path":["兼容性"],"source_commits":[],"source_entry_id":"9.4.0/migration/019","source_hash":"cd56b6d37bd3716333edab6057e06cf5c6ed69d46075fc53894ecd2c53a75d4a","source_url":"/docs/release/9.4.0/#id-1.11.6.31.4","statement_hash":"213b33547cd64665bd26ed6365416f33966e27d9dfbbcb943fcb5674beae1c83","text":"在PL/Python中，像处理底层数组类型一样处理域于数组的类型（Rodolfo Campero） 此前此类值被当作字符串处理。","title":"在PL/Python中，像处理底层数组类型一样处理域于数组的类型","variants":[],"version":"9.4.0"},{"also_in":[],"category":"compatibility","category_label":"Compatibility","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"494110bf09b8a5e2715210c2477792f4","html":"\u003cp\u003e使 libpq 的\u003ca href=\"/docs/9.4/libpq.html#LIBPQ-PQCONNECTDBPARAMS\"\u003e\u003ccode\u003ePQconnectdbParams()\u003c/code\u003e\u003c/a\u003e和\u003ca href=\"/docs/9.4/libpq.html#LIBPQ-PQPINGPARAMS\"\u003e\u003ccode\u003ePQpingParams()\u003c/code\u003e\u003c/a\u003e函数把零长度字符串按默认值处理（Adrian Vondendriesch）\u003c/p\u003e\n\u003cp\u003e此前，这些函数只在某些情况下把零长度字符串值视为选择默认值。\u003c/p\u003e","id":"9.4.0-6e7636440e262e02","identity_text":"Make libpq's PQconnectdbParams() and PQpingParams() functions process zero-length strings as defaults (Adrian Vondendriesch) Previously, these functions treated zero-length string values as selecting the default in only some cases.","part":"migration","patch_ids":[],"related_changes":[],"relations":[],"section":"兼容性","section_path":["兼容性"],"source_commits":[],"source_entry_id":"9.4.0/migration/020","source_hash":"71db09fc54cc5752fd52206bb7bf4534be2f21ef678882219d62d98be265b6e4","source_url":"/docs/release/9.4.0/#id-1.11.6.31.4","statement_hash":"62991b9dea7a2611503bf938a08b4b99afb853425423e7e5800aed05a9b9abdb","text":"使 libpq 的PQconnectdbParams()和PQpingParams()函数把零长度字符串按默认值处理（Adrian Vondendriesch） 此前，这些函数只在某些情况下把零长度字符串值视为选择默认值。","title":"使 libpq 的PQconnectdbParams()和PQpingParams()函数把零长度字符串按默认值处理","variants":[],"version":"9.4.0"},{"also_in":[],"category":"compatibility","category_label":"Compatibility","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"cf287ab236fb7834eb4bb33e1cf829f3","html":"\u003cp\u003e将\u003ca href=\"/docs/9.4/intarray.html\" title=\"F.18. intarray\"\u003eintarray\u003c/a\u003e模块返回的空数组改为零维数组（Bruce Momjian）\u003c/p\u003e\n\u003cp\u003e此前，空数组作为零长度一维数组返回，其文本表示与零维数组（\u003ccode\u003e{}\u003c/code\u003e）看起来相同，但在数组操作中的行为不同。\u003cspan\u003eintarray\u003c/span\u003e在此领域的行为现在与内置数组操作符一致。\u003c/p\u003e","id":"9.4.0-cbb0eb9aa34afdd3","identity_text":"Change empty arrays returned by the intarray module to be zero-dimensional arrays (Bruce Momjian) Previously, empty arrays were returned as zero-length one-dimensional arrays, whose text representation looked the same as zero-dimensional arrays ({}), but they acted differently in array operations. intarray's behavior in this area now matches the built-in array operators.","part":"migration","patch_ids":[],"related_changes":[],"relations":[],"section":"兼容性","section_path":["兼容性"],"source_commits":[],"source_entry_id":"9.4.0/migration/021","source_hash":"3eba2eb9091de75c6f733919d3e518f3e5abcc0beca6fcdcb472d982440a9b58","source_url":"/docs/release/9.4.0/#id-1.11.6.31.4","statement_hash":"56c8a7e64b806cf9001a02a1784a2f1921437f48a1f8fb80c9854d7a7ea43843","text":"将intarray模块返回的空数组改为零维数组（Bruce Momjian） 此前，空数组作为零长度一维数组返回，其文本表示与零维数组（{}）看起来相同，但在数组操作中的行为不同。intarray在此领域的行为现在与内置数组操作符一致。","title":"将intarray模块返回的空数组改为零维数组","variants":[],"version":"9.4.0"},{"also_in":[],"category":"compatibility","category_label":"Compatibility","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"01e68b392d7921cd460914a20733267f","html":"\u003cp\u003e\u003ca href=\"/docs/9.4/pgupgrade.html\" title=\"pg_upgrade\"\u003e\u003cspan\u003e\u003cspan\u003epg_upgrade\u003c/span\u003e\u003c/span\u003e\u003c/a\u003e现在使用\u003ccode\u003e-U\u003c/code\u003e或\u003ccode\u003e--username\u003c/code\u003e指定用户名（Bruce Momjian）\u003c/p\u003e\n\u003cp\u003e此前该选项拼作\u003ccode\u003e-u\u003c/code\u003e或\u003ccode\u003e--user\u003c/code\u003e，但这与其他工具不一致。\u003c/p\u003e","id":"9.4.0-dd99b31a4bd867c8","identity_text":"pgupgrade now uses -U or --username to specify the user name (Bruce Momjian) Previously this option was spelled -u or --user, but that was inconsistent with other tools.","part":"migration","patch_ids":[],"related_changes":[],"relations":[],"section":"兼容性","section_path":["兼容性"],"source_commits":[],"source_entry_id":"9.4.0/migration/022","source_hash":"14b799f5ee9f0bd7221ee396aa2c1fb44994687c2f8e7f903073d6dde0ca9642","source_url":"/docs/release/9.4.0/#id-1.11.6.31.4","statement_hash":"94d17ed9e23f5d9a51ae1a23a86658d73ba4afdebd96f18d478cd22fdd2534c2","text":"pg_upgrade现在使用-U或--username指定用户名（Bruce Momjian） 此前该选项拼作-u或--user，但这与其他工具不一致。","title":"pg_upgrade现在使用-U或--username指定用户名","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"6bbf7c7fbfabd6d22747374fd1d44e42","html":"\u003cp\u003e允许动态注册、启动和终止\u003ca href=\"/docs/9.4/bgworker.html\" title=\"第 45 章 后台工作进程\"\u003e后台工作进程\u003c/a\u003e（Robert Haas）\u003c/p\u003e\n\u003cp\u003e新的\u003ccode\u003eworker_spi\u003c/code\u003e模块展示了此功能的使用示例。\u003c/p\u003e","id":"9.4.0-be05a4d93e841f42","identity_text":"Allow background worker processes to be dynamically registered, started and terminated (Robert Haas) The new worker_spi module shows an example of use of this feature.","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"服务器","section_path":["服务器"],"source_commits":[],"source_entry_id":"9.4.0/changes/001","source_hash":"56fc008475bff13b1f04bc65d69bcbd9f931951be4571c5bd7502790f8341ebb","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.3","statement_hash":"87018103150fc4ac4755363707e0153ff34860bd16c6a78be23129acbe25fc9a","text":"允许动态注册、启动和终止后台工作进程（Robert Haas） 新的worker_spi模块展示了此功能的使用示例。","title":"允许动态注册、启动和终止后台工作进程","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"dc33cb4e630d49076f431f5ec067883f","html":"\u003cp\u003e允许动态分配共享内存段（Robert Haas、Amit Kapila）\u003c/p\u003e\n\u003cp\u003e此功能在\u003ccode\u003etest_shm_mq\u003c/code\u003e模块中有演示。\u003c/p\u003e","id":"9.4.0-cc51c1cc5f51323a","identity_text":"Allow dynamic allocation of shared memory segments (Robert Haas, Amit Kapila) This feature is illustrated in the test_shm_mq module.","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"服务器","section_path":["服务器"],"source_commits":[],"source_entry_id":"9.4.0/changes/002","source_hash":"29a628e8aa8f25eedd52049d4f5909c818b17d1bc10c75bef9885813ec0fc267","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.3","statement_hash":"8daacb7e8f519d9ab6af2bef41ca0755f7d2bffd6c1b154435ad558249c3aae8","text":"允许动态分配共享内存段（Robert Haas、Amit Kapila） 此功能在test_shm_mq模块中有演示。","title":"允许动态分配共享内存段","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"3b326fe80bca53370ef8664edf7e21d5","html":"\u003cp\u003e在崩溃恢复或立即关闭期间，向未及时关闭的子进程发送不可捕获的终止信号（\u003cspan\u003eSIGKILL\u003c/span\u003e）（MauMau, Álvaro Herrera）\u003c/p\u003e\n\u003cp\u003e这减少了\u003ca href=\"/docs/9.4/app-postmaster.html\" title=\"postmaster\"\u003e\u003cspan\u003e\u003cspan\u003epostmaster\u003c/span\u003e\u003c/span\u003e\u003c/a\u003e关闭后遗留孤儿子进程的可能性，同时确保在某些子进程已经\u003cspan\u003e“\u003cspan\u003e卡住\u003c/span\u003e”\u003c/span\u003e时崩溃恢复仍能继续。\u003c/p\u003e","id":"9.4.0-ee42438f2aec4eb1","identity_text":"During crash recovery or immediate shutdown, send uncatchable termination signals (SIGKILL) to child processes that do not shut down promptly (MauMau, Álvaro Herrera) This reduces the likelihood of leaving orphaned child processes behind after app-postmaster shutdown, as well as ensuring that crash recovery can proceed if some child processes have become stuck.","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"服务器","section_path":["服务器"],"source_commits":[],"source_entry_id":"9.4.0/changes/003","source_hash":"5147ca838a62a84796bfb1a46056b81b7286b95ef16a77911de15c9e10a7d4b9","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.3","statement_hash":"f269c973228c3c5024cccb5a7107da291812b04b94892dc34331dd9b79ec4a12","text":"在崩溃恢复或立即关闭期间，向未及时关闭的子进程发送不可捕获的终止信号（SIGKILL）（MauMau, Álvaro Herrera） 这减少了postmaster关闭后遗留孤儿子进程的可能性，同时确保在某些子进程已经“卡住”时崩溃恢复仍能继续。","title":"在崩溃恢复或立即关闭期间，向未及时关闭的子进程发送不可捕获的终止信号（SIGKILL）","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"f82f7d18e10194b912075458a0157bda","html":"\u003cp\u003e改进数据库系统标识符的随机性（Tom Lane）\u003c/p\u003e","id":"9.4.0-186cc4107a640b9b","identity_text":"Improve randomness of the database system identifier (Tom Lane)","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"服务器","section_path":["服务器"],"source_commits":[],"source_entry_id":"9.4.0/changes/004","source_hash":"15da52ee57d5c08467ad1e1606ccf0aa28376133d6013b2d98816f0ac264c69f","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.3","statement_hash":"6947ca5d79e93f31d05ca4b99354aacc68c4a0f702fba7a0df888785f2721ba0","text":"改进数据库系统标识符的随机性（Tom Lane）","title":"改进数据库系统标识符的随机性","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"09b6ec6672cc553fa6950077a97ef9d4","html":"\u003cp\u003e使\u003ca href=\"/docs/9.4/sql-vacuum.html\" title=\"VACUUM\"\u003e\u003cspan\u003eVACUUM\u003c/span\u003e\u003c/a\u003e向统计信息收集器正确报告已死但尚不能移除的行（Hari Babu）\u003c/p\u003e\n\u003cp\u003e此前这些行被报告为活行。\u003c/p\u003e","id":"9.4.0-864f88546565f5d2","identity_text":"Make SQL-VACUUM properly report dead but not-yet-removable rows to the statistics collector (Hari Babu) Previously these were reported as live rows.","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"服务器","section_path":["服务器"],"source_commits":[],"source_entry_id":"9.4.0/changes/005","source_hash":"c6fb23f3b6fb202a6af57670c49da5d8c624ea3f375900a39292f7e7458fe47a","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.3","statement_hash":"a69e1e915007f7476bb1ed0e2899bf9670e4e3ae215fa5ae4d99e7b17b47ccd1","text":"使VACUUM向统计信息收集器正确报告已死但尚不能移除的行（Hari Babu） 此前这些行被报告为活行。","title":"使VACUUM向统计信息收集器正确报告已死但尚不能移除的行","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"7aad6746e357fab367263b118f8f3b1e","html":"\u003cp\u003e减小\u003ca href=\"/docs/9.4/gin.html\" title=\"第 58 章 GIN 索引\"\u003e\u003cacronym\u003eGIN\u003c/acronym\u003e\u003c/a\u003e索引的大小（Alexander Korotkov、Heikki Linnakangas）\u003c/p\u003e\n\u003cp\u003e通过\u003ca href=\"/docs/9.4/pgupgrade.html\" title=\"pg_upgrade\"\u003e\u003cspan\u003e\u003cspan\u003epg_upgrade\u003c/span\u003e\u003c/span\u003e\u003c/a\u003e升级的索引仍能正常工作，但仍是旧的、较大的\u003cacronym\u003eGIN\u003c/acronym\u003e格式。使用\u003ca href=\"/docs/9.4/sql-reindex.html\" title=\"REINDEX\"\u003e\u003cspan\u003eREINDEX\u003c/span\u003e\u003c/a\u003e可以按新格式重建旧的 GIN 索引。\u003c/p\u003e","id":"9.4.0-3cb32694a4f6108a","identity_text":"Reduce GIN index size (Alexander Korotkov, Heikki Linnakangas) Indexes upgraded via pgupgrade will work fine but will still be in the old, larger GIN format. Use SQL-REINDEX to recreate old GIN indexes in the new format.","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"服务器 / 索引","section_path":["服务器","索引"],"source_commits":[],"source_entry_id":"9.4.0/changes/006","source_hash":"9413c50a99e9eb2033cc8bcd157376206522304023b72d24994946ccf53768bf","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.3.3","statement_hash":"dadc3ba950b5670042d2edb8c78c25409b2273da4baf37c64d3e523565d06e04","text":"减小GIN索引的大小（Alexander Korotkov、Heikki Linnakangas） 通过pg_upgrade升级的索引仍能正常工作，但仍是旧的、较大的GIN格式。使用REINDEX可以按新格式重建旧的 GIN 索引。","title":"减小GIN索引的大小","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"f69712068fd21bc72b589fab320fa389","html":"\u003cp\u003e提高多键 \u003ca href=\"/docs/9.4/gin.html\" title=\"第 58 章 GIN 索引\"\u003e\u003cacronym\u003eGIN\u003c/acronym\u003e\u003c/a\u003e 查找的速度（Alexander Korotkov、Heikki Linnakangas）\u003c/p\u003e","id":"9.4.0-6f3308eca0999d24","identity_text":"Improve speed of multi-key GIN lookups (Alexander Korotkov, Heikki Linnakangas)","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"服务器 / 索引","section_path":["服务器","索引"],"source_commits":[],"source_entry_id":"9.4.0/changes/007","source_hash":"77a1d25cbd35442cb26424ff273922c1133e0fc5706b9c7b04a3a8ab7ed9d398","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.3.3","statement_hash":"c771e2b1b0978927481e93b14819b82153c6991214b8f6d60b67d37a924b23f6","text":"提高多键 GIN 查找的速度（Alexander Korotkov、Heikki Linnakangas）","title":"提高多键 GIN 查找的速度","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"e0d64f244bd25fe25c66ec8f63afde1d","html":"\u003cp\u003e为\u003ca href=\"/docs/9.4/datatype-net-types.html#DATATYPE-INET\" title=\"8.9.1. inet\"\u003e\u003ccode\u003einet\u003c/code\u003e\u003c/a\u003e和\u003ca href=\"/docs/9.4/datatype-net-types.html#DATATYPE-CIDR\" title=\"8.9.2. cidr\"\u003e\u003ccode\u003ecidr\u003c/code\u003e\u003c/a\u003e数据类型新增\u003ca href=\"/docs/9.4/gist.html\" title=\"第 56 章 GiST 索引\"\u003e\u003cacronym\u003eGiST\u003c/acronym\u003e\u003c/a\u003e索引支持（Emre Hasegeli）\u003c/p\u003e\n\u003cp\u003e此类索引可改进\u003ca href=\"/docs/9.4/functions-net.html#CIDR-INET-OPERATORS-TABLE\" title=\"表 9.34. cidr 和 inet 操作符\"\u003e子网和超网\u003c/a\u003e查找以及排序比较。\u003c/p\u003e","id":"9.4.0-68216ec0808ccb9d","identity_text":"Add GiST index support for inet and cidr data types (Emre Hasegeli) Such indexes improve subnet and supernet lookups and ordering comparisons.","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"服务器 / 索引","section_path":["服务器","索引"],"source_commits":[],"source_entry_id":"9.4.0/changes/008","source_hash":"0f512ccc57bac60cd0fa1312b0779f4a4315a57c8d3c696fc3bbe58054761961","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.3.3","statement_hash":"09f46137e9cd37e823c9f9d75489f528c00d3a4bc2035d948288f5a22ae24725","text":"为inet和cidr数据类型新增GiST索引支持（Emre Hasegeli） 此类索引可改进子网和超网查找以及排序比较。","title":"为inet和cidr数据类型新增GiST索引支持","variants":[],"version":"9.4.0"},{"also_in":[],"category":"bugfix","category_label":"Bug fixes","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"06ece40b8e25b393925515bc395f69d2","html":"\u003cp\u003e修复 B-tree 页删除中罕见的竞态条件（Heikki Linnakangas）\u003c/p\u003e","id":"9.4.0-89e9a305d870be56","identity_text":"Fix rare race condition in B-tree page deletion (Heikki Linnakangas)","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"服务器 / 索引","section_path":["服务器","索引"],"source_commits":[],"source_entry_id":"9.4.0/changes/009","source_hash":"346cbcf0ada59fa0810d53af86a20ee79a61b7117a9c3e3c9a14da0c2e8995b9","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.3.3","statement_hash":"56f715d13a78060d3cc36ba3f0e1420311c33a853420d9c48603fb6af4e7e84d","text":"修复 B-tree 页删除中罕见的竞态条件（Heikki Linnakangas）","title":"修复 B-tree 页删除中罕见的竞态条件","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"a2c2b46170996e572fad79e060e13149","html":"\u003cp\u003e使被中断的 B-tree 页分裂的处理更加健壮（Heikki Linnakangas）\u003c/p\u003e","id":"9.4.0-9e833dec27695a05","identity_text":"Make the handling of interrupted B-tree page splits more robust (Heikki Linnakangas)","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"服务器 / 索引","section_path":["服务器","索引"],"source_commits":[],"source_entry_id":"9.4.0/changes/010","source_hash":"c57917934adc57e155c94beecf4cf5f9adf7cf67c3d058f2261e0f2c7c32b9bc","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.3.3","statement_hash":"7e141ac11c63bd41f7d22717f2c0c2ecff0202861495f3dd5dd775953b0ebe41","text":"使被中断的 B-tree 页分裂的处理更加健壮（Heikki Linnakangas）","title":"使被中断的 B-tree 页分裂的处理更加健壮","variants":[],"version":"9.4.0"},{"also_in":[],"category":"performance","category_label":"Performance","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"e7db278f15b1aa84b046578510d45b95","html":"\u003cp\u003e允许多个后端并发插入\u003ca href=\"/docs/9.4/wal.html\" title=\"第 29 章 可靠性与预写式日志\"\u003e\u003cacronym\u003eWAL\u003c/acronym\u003e\u003c/a\u003e缓冲区（Heikki Linnakangas）\u003c/p\u003e\n\u003cp\u003e这改进了并行写入性能。\u003c/p\u003e","id":"9.4.0-383e233a072a7663","identity_text":"Allow multiple backends to insert into WAL buffers concurrently (Heikki Linnakangas) This improves parallel write performance.","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"服务器 / 总体性能","section_path":["服务器","总体性能"],"source_commits":[],"source_entry_id":"9.4.0/changes/011","source_hash":"474c339439f4a1d224976b77bd6437c7ddd33463ec656679cd132d4c86637198","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.3.4","statement_hash":"6c446fc2fd409389baf6db4015f9116e109191e5399e7dbb1646b67b84966405","text":"允许多个后端并发插入WAL缓冲区（Heikki Linnakangas） 这改进了并行写入性能。","title":"允许多个后端并发插入WAL缓冲区","variants":[],"version":"9.4.0"},{"also_in":[],"category":"performance","category_label":"Performance","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"4e0fa43c316ad08655dc6024c3a1b5bf","html":"\u003cp\u003e有条件地只把已更新行的修改部分写入 \u003ca href=\"/docs/9.4/wal.html\" title=\"第 29 章 可靠性与预写式日志\"\u003e\u003cacronym\u003eWAL\u003c/acronym\u003e\u003c/a\u003e（Amit Kapila）\u003c/p\u003e","id":"9.4.0-1ec9663fd935f220","identity_text":"Conditionally write only the modified portion of updated rows to WAL (Amit Kapila)","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"服务器 / 总体性能","section_path":["服务器","总体性能"],"source_commits":[],"source_entry_id":"9.4.0/changes/012","source_hash":"0fad854397f3e27ce2f506c723cadeba3196103f00bfddaf3c0a39b05a5829a4","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.3.4","statement_hash":"f5211a7cb2e6043e5d79d2270bf0bb3448d30ead8495383d46c3285c49fdce6c","text":"有条件地只把已更新行的修改部分写入 WAL（Amit Kapila）","title":"有条件地只把已更新行的修改部分写入 WAL","variants":[],"version":"9.4.0"},{"also_in":[],"category":"performance","category_label":"Performance","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"cf4768b6273928dbf9f4576a704601a1","html":"\u003cp\u003e改进用作\u003ca href=\"/docs/9.4/sql-expressions.html#SYNTAX-WINDOW-FUNCTIONS\" title=\"4.2.8. 窗口函数调用\"\u003e窗口函数\u003c/a\u003e的聚集函数的性能（David Rowley、Florian Pflug、Tom Lane）\u003c/p\u003e","id":"9.4.0-d6945849edf413ff","identity_text":"Improve performance of aggregate functions used as window functions (David Rowley, Florian Pflug, Tom Lane)","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"服务器 / 总体性能","section_path":["服务器","总体性能"],"source_commits":[],"source_entry_id":"9.4.0/changes/013","source_hash":"b0cf541517cb749e458e3011165da368e3f70a2ddf79b230a88e433dff8c4328","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.3.4","statement_hash":"320fd5a87bcd7169070188c09ed1ce18e52d65a2d87e8d413da27e871833b3af","text":"改进用作窗口函数的聚集函数的性能（David Rowley、Florian Pflug、Tom Lane）","title":"改进用作窗口函数的聚集函数的性能","variants":[],"version":"9.4.0"},{"also_in":[],"category":"performance","category_label":"Performance","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"dc29c5772e80875995dd92d51a760950","html":"\u003cp\u003e提高使用 \u003ca href=\"/docs/9.4/datatype.html#DATATYPE-NUMERIC\" title=\"8.1. 数字类型\"\u003e\u003ccode\u003enumeric\u003c/code\u003e\u003c/a\u003e 状态值的聚集的速度（Hadi Moshayedi）\u003c/p\u003e","id":"9.4.0-7c19538c11ae23d8","identity_text":"Improve speed of aggregates that use numeric state values (Hadi Moshayedi)","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"服务器 / 总体性能","section_path":["服务器","总体性能"],"source_commits":[],"source_entry_id":"9.4.0/changes/014","source_hash":"777fbfd0ce86ed6803eae7763b4e3f766634072acbe7f4c3cf4def362bdcc2c3","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.3.4","statement_hash":"cc780c9f5a80e5c22c23c9b4b0a124672ae60eacc611ab6ddd53d9b3ed994c1a","text":"提高使用 numeric 状态值的聚集的速度（Hadi Moshayedi）","title":"提高使用 numeric 状态值的聚集的速度","variants":[],"version":"9.4.0"},{"also_in":[],"category":"performance","category_label":"Performance","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"1e06349553214390832d4a1d1a593e5a","html":"\u003cp\u003e当表被\u003ca href=\"/docs/9.4/sql-cluster.html\" title=\"CLUSTER\"\u003e\u003cspan\u003eCLUSTER\u003c/span\u003e\u003c/a\u003e或 \u003ca 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子查询中","variants":[],"version":"9.4.0"},{"also_in":[],"category":"performance","category_label":"Performance","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"cf3456311d2cba93729138a6948594fe","html":"\u003cp\u003e自动调整系统目录缓存的大小（Heikki Linnakangas）\u003c/p\u003e\n\u003cp\u003e这减少了只访问少量表的会话的内存消耗，并改进了访问大量表的会话的性能。\u003c/p\u003e","id":"9.4.0-d72ecaeefe9fa82f","identity_text":"Auto-resize the catalog caches (Heikki Linnakangas) This reduces memory consumption for sessions accessing only a few tables, and improves performance for sessions accessing many tables.","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"服务器 / 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Such keys are faster and have better security than RSA keys. 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与local_preload_libraries不同，此参数可以加载任何共享库，而不仅仅是 $libdir/plugins 目录中的库。","title":"新增仅限超级用户的session_preload_libraries参数，用于在会话启动时加载库","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"a1bd9396deaa83aa33410939f61d2fda","html":"\u003cp\u003e新增\u003ca href=\"/docs/9.4/runtime-config-wal.html#GUC-WAL-LOG-HINTS\"\u003ewal_log_hints\u003c/a\u003e参数，用于启用提示位（hint-bit）变更的 WAL 日志（Sawada Masahiko）\u003c/p\u003e\n\u003cp\u003e提示位变更通常不记录日志，启用了校验和时除外。这对 \u003cspan\u003epg_rewind\u003c/span\u003e 等外部工具很有用。\u003c/p\u003e","id":"9.4.0-96f2f36e6655094a","identity_text":"Add guc-wal-log-hints parameter to enable WAL logging of hint-bit changes (Sawada Masahiko) Hint bit changes are not normally logged, except when checksums are enabled. 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href=\"/docs/9.4/runtime-config-resource.html#GUC-MAINTENANCE-WORK-MEM\"\u003emaintenance_work_mem\u003c/a\u003e的默认设置提高到原来的四倍（Bruce Momjian）\u003c/p\u003e\n\u003cp\u003e新的默认值分别为 4MB 和 64MB。\u003c/p\u003e","id":"9.4.0-fca93fd93726cece","identity_text":"Increase the default settings of guc-work-mem and guc-maintenance-work-mem by four times (Bruce Momjian) The new defaults are 4MB and 64MB respectively.","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"服务器 / 服务器设置","section_path":["服务器","服务器设置"],"source_commits":[],"source_entry_id":"9.4.0/changes/037","source_hash":"f997e0da19fd5d0a6e4c71f77583a6db4b6fe7d69ce681225955538b7c01dea4","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.3.7","statement_hash":"46239a5494872eceb2a91aebe91287d6e2862015826065e074fab89f4faaa0a6","text":"将work_mem和maintenance_work_mem的默认设置提高到原来的四倍（Bruce Momjian） 新的默认值分别为 4MB 和 64MB。","title":"将work_mem和maintenance_work_mem的默认设置提高到原来的四倍","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"2362b923433619c47d9f868a1ae98c1b","html":"\u003cp\u003e将\u003ca href=\"/docs/9.4/runtime-config-query.html#GUC-EFFECTIVE-CACHE-SIZE\"\u003eeffective_cache_size\u003c/a\u003e的默认设置提高到 4GB（Bruce Momjian、Tom Lane）\u003c/p\u003e","id":"9.4.0-852fc7b42824b448","identity_text":"Increase the default setting of guc-effective-cache-size to 4GB (Bruce Momjian, Tom Lane)","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"服务器 / 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Riggs)","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"服务器 / 服务器设置","section_path":["服务器","服务器设置"],"source_commits":[],"source_entry_id":"9.4.0/changes/040","source_hash":"f3a286bcaf57e15b8a6a21c3b8d14ea08f164293c7ba79794abdd15d3ef06831","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.3.7","statement_hash":"ec4b943e658b82e46ff21639ae1ccd6409a40b28885b24502bf037d58ec139bc","text":"允许在指定配置变量值时使用太字节单位（TB）（Simon Riggs）","title":"允许在指定配置变量值时使用太字节单位（TB）","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"1a1afa3a58b1623be5778ec951983a90","html":"\u003cp\u003e在\u003ca href=\"/docs/9.4/runtime-config-logging.html#GUC-LOG-LOCK-WAITS\"\u003elog_lock_waits\u003c/a\u003e日志消息中显示锁持有者和等待者的 \u003cacronym\u003ePID\u003c/acronym\u003e，并改进关系相关信息（Christian Kruse）\u003c/p\u003e","id":"9.4.0-a4c8b91934a13d20","identity_text":"Show PIDs of lock holders and waiters and improve information about relations in guc-log-lock-waits log messages (Christian Kruse)","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"服务器 / 服务器设置","section_path":["服务器","服务器设置"],"source_commits":[],"source_entry_id":"9.4.0/changes/041","source_hash":"78ae9969945bf6563a94e44cd151410e4fd3d572802bf991b1182bae8262a37a","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.3.7","statement_hash":"a023242a7e12f3b7d58973c9fb21618a04a3738ad386f70d372c0c52e2c0598b","text":"在log_lock_waits日志消息中显示锁持有者和等待者的 PID，并改进关系相关信息（Christian Kruse）","title":"在log_lock_waits日志消息中显示锁持有者和等待者的 PID，并改进关系相关信息","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"88e4eac3e2c3d60074dcc0668e17cf9d","html":"\u003cp\u003e降低加载共享库时的服务器日志级别（Peter Geoghegan）\u003c/p\u003e\n\u003cp\u003e以前的级别是 \u003ccode\u003eLOG\u003c/code\u003e，对于按会话加载的库来说过于冗长。\u003c/p\u003e","id":"9.4.0-0d768b4956f1f9cc","identity_text":"Reduce server logging level when loading shared libraries (Peter Geoghegan) The previous level was LOG, which was too verbose for libraries loaded per-session.","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"服务器 / 服务器设置","section_path":["服务器","服务器设置"],"source_commits":[],"source_entry_id":"9.4.0/changes/042","source_hash":"2532d0989d43abeb95587d7333e01ccb8f09dacbad13b7c6c0bbec0fea934e70","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.3.7","statement_hash":"c55cc9966f4b2e4e5730a7a42e0cd4a2c2c8ad40de3b4f987496d3d838dcb5e6","text":"降低加载共享库时的服务器日志级别（Peter Geoghegan） 以前的级别是 LOG，对于按会话加载的库来说过于冗长。","title":"降低加载共享库时的服务器日志级别","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"5a48543315c59cf240156344449afafa","html":"\u003cp\u003e在 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服务器设置","section_path":["服务器","服务器设置"],"source_commits":[],"source_entry_id":"9.4.0/changes/043","source_hash":"c74d2448dcd521892519edfaa06d4f412fa797cd62b645fc058b43ed36c892c1","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.3.7","statement_hash":"c5fdaac50a4554b0943ca36e2f4a8fb5b462c8e4d5b9bfe8625aab7738584ea9","text":"在 Windows 上，使 SQL_ASCII 编码的数据库和服务器进程（例如postmaster）以服务器 Windows 用户区域设置的字符编码发出消息（Alexander Law、Noah Misch） 此前这些消息以 Windows ANSI 代码页输出。","title":"在 Windows 上，使 SQL_ASCII 编码的数据库和服务器进程（例如postmaster）以服务器 Windows 用户区域设置的字符编码发出消息","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"b5339fd59177468c25a87bd09b9a6ed5","html":"\u003cp\u003e新增\u003ca href=\"/docs/9.4/warm-standby.html#STREAMING-REPLICATION-SLOTS\" title=\"25.2.6. 复制槽\"\u003e复制槽\u003c/a\u003e，以协调流复制备库与其流来源节点的活动（Andres Freund、Robert Haas）\u003c/p\u003e\n\u003cp\u003e复制槽允许在主库上保留 \u003cacronym\u003eWAL\u003c/acronym\u003e 文件等资源，直到备库服务器不再需要它们。\u003c/p\u003e","id":"9.4.0-4cc01a59391e634e","identity_text":"Add replication slots to coordinate activity on streaming standbys with the node they are streaming from (Andres Freund, Robert Haas) Replication slots allow preservation of resources like WAL files on the primary until they are no longer needed by standby servers.","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"复制与恢复","section_path":["复制与恢复"],"source_commits":[],"source_entry_id":"9.4.0/changes/044","source_hash":"ea00084c07865b1b487d6ff52c88ea265b39010caaf10780936a69722be7ef31","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.4","statement_hash":"3e8414575e68244ed55722bedf4833dd8538b9ccecb50956ed187f4bd63074e7","text":"新增复制槽，以协调流复制备库与其流来源节点的活动（Andres Freund、Robert Haas） 复制槽允许在主库上保留 WAL 文件等资源，直到备库服务器不再需要它们。","title":"新增复制槽，以协调流复制备库与其流来源节点的活动","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"18c6c73e4b2a436c5cff78cce907e807","html":"\u003cp\u003e新增恢复参数\u003ca href=\"/docs/9.4/standby-settings.html#RECOVERY-MIN-APPLY-DELAY\"\u003erecovery_min_apply_delay\u003c/a\u003e以延迟复制（Robert Haas, Fabrízio de Royes Mello、Simon Riggs）\u003c/p\u003e\n\u003cp\u003e延迟备库服务器上的重放对于从用户错误中恢复可能很有用。\u003c/p\u003e","id":"9.4.0-b710b15be81ba1ec","identity_text":"Add recovery parameter recovery-min-apply-delay to delay replication (Robert Haas, Fabrízio de Royes Mello, Simon Riggs) Delaying replay on standby servers can be useful for recovering from user errors.","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"复制与恢复","section_path":["复制与恢复"],"source_commits":[],"source_entry_id":"9.4.0/changes/045","source_hash":"7413dace8ca5108ec33820097ae79ce76aeec58142e74342778f81be341061df","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.4","statement_hash":"53141d1ddcac011217542954de2cc34493f9e42cb82bf698ed7c68b036327379","text":"新增恢复参数recovery_min_apply_delay以延迟复制（Robert Haas, Fabrízio de Royes Mello、Simon Riggs） 延迟备库服务器上的重放对于从用户错误中恢复可能很有用。","title":"新增恢复参数recovery_min_apply_delay以延迟复制","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"1468649948f2d48adadc454691568704","html":"\u003cp\u003e新增\u003ca href=\"/docs/9.4/recovery-target-settings.html#RECOVERY-TARGET\"\u003erecovery_target\u003c/a\u003e选项 \u003ccode\u003eimmediate\u003c/code\u003e，在达到一致状态后立即停止 \u003ca href=\"/docs/9.4/wal.html\" title=\"第 29 章 可靠性与预写式日志\"\u003e\u003cacronym\u003eWAL\u003c/acronym\u003e\u003c/a\u003e 恢复（MauMau、Heikki Linnakangas）\u003c/p\u003e","id":"9.4.0-944163048dc617f7","identity_text":"Add recovery-target option immediate to stop WAL recovery as soon as a consistent state is reached (MauMau, Heikki Linnakangas)","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"复制与恢复","section_path":["复制与恢复"],"source_commits":[],"source_entry_id":"9.4.0/changes/046","source_hash":"61f84facd316eaad6d31fa1f7c2d7a564f75a816a5c3da9fda869686dcab07ec","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.4","statement_hash":"c879a4f0f5cf76655046e262da00b86c65fa2418e53f51b7ba76f7245e40a8df","text":"新增recovery_target选项 immediate，在达到一致状态后立即停止 WAL 恢复（MauMau、Heikki Linnakangas）","title":"新增recovery_target选项 immediate，在达到一致状态后立即停止 WAL 恢复","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"ae3eb09230b5ba0507ec3dc05edeb981","html":"\u003cp\u003e改进恢复目标的处理（Heikki Linnakangas）\u003c/p\u003e\n\u003cp\u003e\u003ca href=\"/docs/9.4/functions-admin.html#FUNCTIONS-RECOVERY-INFO-TABLE\" title=\"表 9.66. 恢复信息函数\"\u003e\u003ccode\u003epg_last_xact_replay_timestamp()\u003c/code\u003e\u003c/a\u003e 报告的时间戳现在反映已提交的记录，而不是将要提交的事务。恢复到还原点现在会重放到还原点本身，而不是在还原点之前停止。\u003c/p\u003e","id":"9.4.0-df085c7700237e40","identity_text":"Improve recovery target processing (Heikki Linnakangas) The timestamp reported by pg_last_xact_replay_timestamp() now reflects already-committed records, not transactions about to be committed. Recovering to a restore point now replays the restore point, rather than stopping just before the restore point.","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"复制与恢复","section_path":["复制与恢复"],"source_commits":[],"source_entry_id":"9.4.0/changes/047","source_hash":"0e79a45d52db0b62d2494d1187e0bf0cb951de935818962f15f531eed2518e19","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.4","statement_hash":"bbc35acf23fe3b5e76a93d2843221b2f5da697cecc630b09396ddecdf5931d74","text":"改进恢复目标的处理（Heikki Linnakangas） pg_last_xact_replay_timestamp() 报告的时间戳现在反映已提交的记录，而不是将要提交的事务。恢复到还原点现在会重放到还原点本身，而不是在还原点之前停止。","title":"改进恢复目标的处理","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"1a58dba97103d15b4af7b63789b3b271","html":"\u003cp\u003e\u003ca href=\"/docs/9.4/functions-admin.html#FUNCTIONS-ADMIN-BACKUP-TABLE\" 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SQL-SELECT to have an empty target list (Tom Lane) This was added so that views that select from a table with zero columns can be dumped and restored correctly.","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"查询","section_path":["查询"],"source_commits":[],"source_entry_id":"9.4.0/changes/060","source_hash":"5d72eb1f94a93b44185f06a9c236beb010dac46334f0f281e924103fbc627fa0","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.5","statement_hash":"418d86d2a591dbea3d5bf827c80024d81cf7ca89baccff1cc28fe544809012bd","text":"允许SELECT拥有空目标列表（Tom Lane） 增加此功能是为了使从零列表中选择的视图能够被正确转储和还原。","title":"允许SELECT拥有空目标列表","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"527a24244be4d7b01f3a5fc3cefc4b13","html":"\u003cp\u003e确保 \u003ca href=\"/docs/9.4/sql-select.html\" title=\"SELECT\"\u003e\u003ccode\u003eSELECT ... 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FOR UPDATE NOWAIT 在涉及已被并发更新元组的极端情况下不会等待","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"e997d50d211ae7ad274a92a2424c4cb6","html":"\u003cp\u003e新增 \u003ca href=\"/docs/9.4/sql-discard.html\" title=\"DISCARD\"\u003e\u003ccode\u003eDISCARD SEQUENCES\u003c/code\u003e\u003c/a\u003e 命令，用于丢弃缓存的序列相关状态（Fabrízio de Royes Mello、Robert Haas）\u003c/p\u003e\n\u003cp\u003e\u003ccode\u003eDISCARD ALL\u003c/code\u003e 现在也会丢弃此类信息。\u003c/p\u003e","id":"9.4.0-8bd687a4ed5b8d28","identity_text":"Add DISCARD SEQUENCES command to discard cached sequence-related state (Fabrízio de Royes Mello, Robert Haas) DISCARD ALL will now also discard such information.","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"工具命令","section_path":["工具命令"],"source_commits":[],"source_entry_id":"9.4.0/changes/062","source_hash":"3fcd8539a1c184b6c3bf7bc4826b4c8ab4c0bb0835d7e3789a375e16ab5da969","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.6","statement_hash":"3bae31298e094673fc3348747e4f90c092f238e95ec3dbce19a31f5d9431e2d5","text":"新增 DISCARD SEQUENCES 命令，用于丢弃缓存的序列相关状态（Fabrízio de Royes Mello、Robert Haas） DISCARD ALL 现在也会丢弃此类信息。","title":"新增 DISCARD SEQUENCES 命令，用于丢弃缓存的序列相关状态","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"5f1685d9fbb1098ac4368fbfab40e86b","html":"\u003cp\u003e为 \u003ca href=\"/docs/9.4/sql-copy.html\" title=\"COPY\"\u003e\u003ccode\u003eCOPY FROM\u003c/code\u003e\u003c/a\u003e 新增 \u003ccode\u003eFORCE NULL\u003c/code\u003e 选项，在 \u003ccode\u003eCSV\u003c/code\u003e 模式下使与指定空串匹配的带引号字符串转换为 NULL（Ian Barwick、Michael Paquier）\u003c/p\u003e\n\u003cp\u003e若不使用此选项，则只有不带引号的匹配字符串才会被导入为空值。\u003c/p\u003e","id":"9.4.0-30c3326b4bc6248e","identity_text":"Add FORCE NULL option to COPY FROM, which causes quoted strings matching the specified null string to be converted to NULLs in CSV mode (Ian Barwick, Michael Paquier) Without this option, only unquoted matching strings will be imported as null values.","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"工具命令","section_path":["工具命令"],"source_commits":[],"source_entry_id":"9.4.0/changes/063","source_hash":"2791c7650c26cb8e1c01d2fce4ad74950cfd7a9c80a8ee1b70c13fb130801c44","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.6","statement_hash":"8430ee41f6683782260e52fea2f9e243e7b7c5dc2a474936e147038a0a154a3f","text":"为 COPY FROM 新增 FORCE NULL 选项，在 CSV 模式下使与指定空串匹配的带引号字符串转换为 NULL（Ian Barwick、Michael Paquier） 若不使用此选项，则只有不带引号的匹配字符串才会被导入为空值。","title":"为 COPY FROM 新增 FORCE NULL 选项，在 CSV 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block.","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"工具命令","section_path":["工具命令"],"source_commits":[],"source_entry_id":"9.4.0/changes/064","source_hash":"fb04b524ac687cf87ac1f87d32ac79a7b7e0e394cb664b6e820765c2a4bb7c9b","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.6","statement_hash":"639974640d1829b921ce1930156832fce6ef412aefc23cb019e34dd9108af33b","text":"对在事务块之外使用且不可能生效的命令发出警告（Bruce Momjian） 当 SET LOCAL、SET CONSTRAINTS、SET TRANSACTION 和 ABORT 在事务块之外使用时会发出新的警告。","title":"对在事务块之外使用且不可能生效的命令发出警告","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"995c57366e3151d398ebdd157281ea75","html":"\u003cp\u003e使 \u003ccode\u003eEXPLAIN ANALYZE\u003c/code\u003e 显示规划时间（Andreas Karlsson）\u003c/p\u003e","id":"9.4.0-71e51a3c18af2bea","identity_text":"Make EXPLAIN ANALYZE show planning time (Andreas 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MATERIALIZED VIEW\"\u003e\u003ccode\u003eREFRESH MATERIALIZED VIEW CONCURRENTLY\u003c/code\u003e\u003c/a\u003e 完成。\u003c/p\u003e","id":"9.4.0-2003def672391fe9","identity_text":"Allow a materialized view to be refreshed without blocking other sessions from reading the view meanwhile (Kevin Grittner) This is done with REFRESH MATERIALIZED VIEW CONCURRENTLY.","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"工具命令 / 视图","section_path":["工具命令","视图"],"source_commits":[],"source_entry_id":"9.4.0/changes/068","source_hash":"497d477685b294aec55b34f60596113fa7883fbbe06b058340314bb88bb2605d","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.6.4","statement_hash":"ad06ce97fbc6907606c4afc6937431dfd8852476969ffea6229ebef48c38b44e","text":"允许刷新物化视图而不阻塞其他会话在此期间读取该视图（Kevin Grittner） 这通过 REFRESH MATERIALIZED VIEW CONCURRENTLY 完成。","title":"允许刷新物化视图而不阻塞其他会话在此期间读取该视图","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"2cbd6b47d7c55eeae1ab5ffc90279de4","html":"\u003cp\u003e允许视图被\u003ca href=\"/docs/9.4/sql-createview.html#SQL-CREATEVIEW-UPDATABLE-VIEWS\" title=\"可更新视图\"\u003e自动更新\u003c/a\u003e，即使它们包含一些不可更新的列（Dean Rasheed）\u003c/p\u003e\n\u003cp\u003e此前，存在表达式、字面量和函数调用等不可更新输出列会阻止自动更新。现在支持 \u003ccode\u003eINSERT\u003c/code\u003e、\u003ccode\u003eUPDATE\u003c/code\u003e 和 \u003ccode\u003eDELETE\u003c/code\u003e，只要它们不试图为任何不可更新列赋新值。\u003c/p\u003e","id":"9.4.0-24adc04b8951ecd8","identity_text":"Allow views to be automatically updated even if they contain some non-updatable columns (Dean Rasheed) Previously the presence of non-updatable output columns such as expressions, literals, and function calls prevented automatic updates. Now INSERTs, UPDATEs and DELETEs are supported, provided that they do not attempt to assign new values to any of the non-updatable columns.","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"工具命令 / 视图","section_path":["工具命令","视图"],"source_commits":[],"source_entry_id":"9.4.0/changes/069","source_hash":"d5a710154128f669c9b04c462c4077a74ec3306b3ca2396264a0156219a6eb43","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.6.4","statement_hash":"be8db8dce1437d209a447cf18b2ea113742f90cef7d066b2b4d77734e8805f75","text":"允许视图被自动更新，即使它们包含一些不可更新的列（Dean Rasheed） 此前，存在表达式、字面量和函数调用等不可更新输出列会阻止自动更新。现在支持 INSERT、UPDATE 和 DELETE，只要它们不试图为任何不可更新列赋新值。","title":"允许视图被自动更新，即使它们包含一些不可更新的列","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"da8bf77cc1d56ef46ca27c0d37bd7461","html":"\u003cp\u003e允许控制 \u003ccode\u003eINSERT\u003c/code\u003e 和 \u003ccode\u003eUPDATE\u003c/code\u003e 能否向自动可更新视图中添加不会出现在该视图中的行（Dean Rasheed）\u003c/p\u003e\n\u003cp\u003e这通过新的\u003ca href=\"/docs/9.4/sql-createview.html\" title=\"CREATE VIEW\"\u003e\u003cspan\u003eCREATE VIEW\u003c/span\u003e\u003c/a\u003e子句 \u003ccode\u003eWITH CHECK OPTION\u003c/code\u003e 控制。\u003c/p\u003e","id":"9.4.0-7b9247b2955feffe","identity_text":"Allow control over whether INSERTs and UPDATEs can add rows to an auto-updatable view that would not appear in the view (Dean Rasheed) This is controlled with the new SQL-CREATEVIEW clause WITH CHECK OPTION.","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"工具命令 / 视图","section_path":["工具命令","视图"],"source_commits":[],"source_entry_id":"9.4.0/changes/070","source_hash":"377a2e8087930fe7d5ee74ff58686172d529721a7eb50aae913175b61a39fa85","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.6.4","statement_hash":"23b982d1697bbadc1b4cddaa29c840ccd31418d70ce30cc93b90f892ca68e316","text":"允许控制 INSERT 和 UPDATE 能否向自动可更新视图中添加不会出现在该视图中的行（Dean Rasheed） 这通过新的CREATE VIEW子句 WITH CHECK OPTION 控制。","title":"允许控制 INSERT 和 UPDATE 能否向自动可更新视图中添加不会出现在该视图中的行","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"23d9edbf02e80238bc2533231f095468","html":"\u003cp\u003e允许\u003ca href=\"/docs/9.4/rules-privileges.html\" title=\"38.5. 规则和权限\"\u003e安全屏障视图\u003c/a\u003e被自动更新（Dean Rasheed）\u003c/p\u003e","id":"9.4.0-1b16d424d83efd12","identity_text":"Allow security barrier views to be automatically updatable (Dean Rasheed)","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"工具命令 / 视图","section_path":["工具命令","视图"],"source_commits":[],"source_entry_id":"9.4.0/changes/071","source_hash":"e704571f0bcd161e217cd16316a6a68340651d8f9bd49868b5077ae30191170d","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.6.4","statement_hash":"2f9e1ca4ca0895e4821e740ebeda3eee1186f8bdc1a0ac2fce43e321de1be31c","text":"允许安全屏障视图被自动更新（Dean Rasheed）","title":"允许安全屏障视图被自动更新","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"669db79a26348c7bd9347064f5cf481f","html":"\u003cp\u003e支持在\u003ca href=\"/docs/9.4/sql-createforeigntable.html\" title=\"CREATE FOREIGN TABLE\"\u003e外部表\u003c/a\u003e上使用触发器（Ronan Dunklau）\u003c/p\u003e","id":"9.4.0-960eea84a0e151e1","identity_text":"Support triggers on foreign tables (Ronan Dunklau)","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"对象操作","section_path":["对象操作"],"source_commits":[],"source_entry_id":"9.4.0/changes/072","source_hash":"d2c7ff03f51295e4a3efa52dcaf4a6295f95c090751d02c9e38df91b4543f517","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.7","statement_hash":"b44cb199ca0699c8f4e03d817e217ce6e02ab7d887f9592b886e805dd2f91501","text":"支持在外部表上使用触发器（Ronan Dunklau）","title":"支持在外部表上使用触发器","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"b82355d6227386532ce26f9bb862d3bb","html":"\u003cp\u003e允许使用\u003ca href=\"/docs/9.4/sql-altertable.html\" title=\"ALTER TABLE\"\u003e\u003cspan\u003eALTER TABLE\u003c/span\u003e\u003c/a\u003e、\u003ca href=\"/docs/9.4/sql-alterindex.html\" title=\"ALTER INDEX\"\u003e\u003cspan\u003eALTER INDEX\u003c/span\u003e\u003c/a\u003e或\u003ca href=\"/docs/9.4/sql-altermaterializedview.html\" title=\"ALTER MATERIALIZED VIEW\"\u003e\u003cspan\u003eALTER MATERIALIZED VIEW\u003c/span\u003e\u003c/a\u003e的 \u003ccode\u003eALL IN TABLESPACE ... SET TABLESPACE\u003c/code\u003e 形式把成组对象从一个表空间移动到另一个表空间（Stephen Frost）\u003c/p\u003e","id":"9.4.0-bf6d33c168b608bc","identity_text":"Allow moving groups of objects from one tablespace to another using the ALL IN TABLESPACE ... SET TABLESPACE form of SQL-ALTERTABLE , SQL-ALTERINDEX , or SQL-ALTERMATERIALIZEDVIEW (Stephen Frost)","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"对象操作","section_path":["对象操作"],"source_commits":[],"source_entry_id":"9.4.0/changes/073","source_hash":"76b4ede66829c88251988027ba962189bf4ecc9e493c4e796817b4a19aed2cf3","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.7","statement_hash":"d2eb9d6ad9d1e5278d9d02ba21455a2afe927523439679640f4873978cae0f7a","text":"允许使用ALTER TABLE、ALTER INDEX或ALTER MATERIALIZED VIEW的 ALL IN TABLESPACE ... SET TABLESPACE 形式把成组对象从一个表空间移动到另一个表空间（Stephen Frost）","title":"允许使用ALTER TABLE、ALTER INDEX或ALTER MATERIALIZED VIEW的 ALL IN TABLESPACE ... SET TABLESPACE 形式把成组对象从一个表空间移动到另一个表空间","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"102f396fcf51b83b46d090d33f5000e3","html":"\u003cp\u003e允许通过\u003ca href=\"/docs/9.4/sql-altertable.html\" title=\"ALTER TABLE\"\u003e\u003cspan\u003eALTER TABLE\u003c/span\u003e\u003c/a\u003e ... \u003ccode\u003eALTER CONSTRAINT\u003c/code\u003e 更改外键约束的可延迟性（Simon Riggs）\u003c/p\u003e","id":"9.4.0-9385d6b48eda273e","identity_text":"Allow changing foreign key constraint deferrability via SQL-ALTERTABLE ... ALTER CONSTRAINT (Simon Riggs)","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"对象操作","section_path":["对象操作"],"source_commits":[],"source_entry_id":"9.4.0/changes/074","source_hash":"5ac9b76b9a4d62521c6f5f1d279a93a022b6eb2a1543d2b0b09726f045eac450","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.7","statement_hash":"6784c8b5f75f253134bda86416902b79415384f47c0927e32c6451afdd62126a","text":"允许通过ALTER TABLE ... ALTER CONSTRAINT 更改外键约束的可延迟性（Simon Riggs）","title":"允许通过ALTER TABLE ... ALTER CONSTRAINT 更改外键约束的可延迟性","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"6f9e043bb929a6be871c03c16472b21f","html":"\u003cp\u003e降低某些\u003ca href=\"/docs/9.4/sql-altertable.html\" title=\"ALTER TABLE\"\u003e\u003cspan\u003eALTER TABLE\u003c/span\u003e\u003c/a\u003e命令的锁强度（Simon Riggs、Noah Misch、Robert Haas）\u003c/p\u003e\n\u003cp\u003e具体而言，\u003ccode\u003eVALIDATE CONSTRAINT\u003c/code\u003e、\u003ccode\u003eCLUSTER ON\u003c/code\u003e、\u003ccode\u003eSET WITHOUT CLUSTER\u003c/code\u003e、\u003ccode\u003eALTER COLUMN SET STATISTICS\u003c/code\u003e、\u003ccode\u003eALTER COLUMN\u003c/code\u003e \u003ccode\u003eSET\u003c/code\u003e \u003ccode\u003e(attribute_option)\u003c/code\u003e、\u003ccode\u003eALTER COLUMN RESET\u003c/code\u003e \u003ccode\u003e(attribute_option)\u003c/code\u003e 不再需要 \u003ccode\u003eACCESS EXCLUSIVE\u003c/code\u003e 锁。\u003c/p\u003e","id":"9.4.0-518c5f5c9167628f","identity_text":"Reduce lock strength for some SQL-ALTERTABLE commands (Simon Riggs, Noah Misch, Robert Haas) Specifically, VALIDATE CONSTRAINT, CLUSTER ON, SET WITHOUT CLUSTER, ALTER COLUMN SET STATISTICS, ALTER COLUMN SET (attribute_option), ALTER COLUMN RESET (attribute_option) no longer require ACCESS EXCLUSIVE locks.","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"对象操作","section_path":["对象操作"],"source_commits":[],"source_entry_id":"9.4.0/changes/075","source_hash":"4641ae0c85fddf49587ac0fb791eaa9af70d8afa7934636817c1059eacc8e719","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.7","statement_hash":"11a395993757eab8954d263cc665ea67e20bf143574c653d9ace17cdf2ac01bd","text":"降低某些ALTER TABLE命令的锁强度（Simon Riggs、Noah Misch、Robert Haas） 具体而言，VALIDATE CONSTRAINT、CLUSTER ON、SET WITHOUT CLUSTER、ALTER COLUMN SET STATISTICS、ALTER COLUMN SET (attribute_option)、ALTER COLUMN RESET (attribute_option) 不再需要 ACCESS EXCLUSIVE 锁。","title":"降低某些ALTER TABLE命令的锁强度","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"656ae68c7b645ad0691486c3e5a03726","html":"\u003cp\u003e允许在\u003ca href=\"/docs/9.4/sql-createtablespace.html\" title=\"CREATE TABLESPACE\"\u003e\u003cspan\u003eCREATE TABLESPACE\u003c/span\u003e\u003c/a\u003e中设置表空间选项（Vik Fearing）\u003c/p\u003e\n\u003cp\u003e以前这些选项只能通过\u003ca href=\"/docs/9.4/sql-altertablespace.html\" title=\"ALTER TABLESPACE\"\u003e\u003cspan\u003eALTER TABLESPACE\u003c/span\u003e\u003c/a\u003e设置。\u003c/p\u003e","id":"9.4.0-5035773425c2b4ae","identity_text":"Allow tablespace options to be set in SQL-CREATETABLESPACE (Vik Fearing) Formerly these options could only be set via SQL-ALTERTABLESPACE .","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"对象操作","section_path":["对象操作"],"source_commits":[],"source_entry_id":"9.4.0/changes/076","source_hash":"367a90f9e602ced97ee70863558a59433401f2b057f454566bf1648d523decc4","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.7","statement_hash":"bec92b9961609d0ee63938645c8d9ac28a414db2f99d10bc1e857450e6082e71","text":"允许在CREATE TABLESPACE中设置表空间选项（Vik Fearing） 以前这些选项只能通过ALTER TABLESPACE设置。","title":"允许在CREATE TABLESPACE中设置表空间选项","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"19027cae29d30e419385ff17deca37c9","html":"\u003cp\u003e允许\u003ca href=\"/docs/9.4/sql-createaggregate.html\" title=\"CREATE AGGREGATE\"\u003e\u003cspan\u003eCREATE AGGREGATE\u003c/span\u003e\u003c/a\u003e定义聚集转换状态数据的估计大小（Hadi Moshayedi）\u003c/p\u003e\n\u003cp\u003e恰当使用此功能可使规划器更好地估计聚集将使用多少内存。\u003c/p\u003e","id":"9.4.0-bdc5b8141dc110eb","identity_text":"Allow SQL-CREATEAGGREGATE to define the estimated size of the aggregate's transition state data (Hadi Moshayedi) Proper use of this feature allows the planner to better estimate how much memory will be used by aggregates.","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"对象操作","section_path":["对象操作"],"source_commits":[],"source_entry_id":"9.4.0/changes/077","source_hash":"5639f2a69bf04099101ade44971155792106cd455d057c42795fab017b025e15","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.7","statement_hash":"6ec29a5fdca0d8ae8ffd9e105e7eff665b63c1ed81dbaf40d3bd010a60ae9f61","text":"允许CREATE AGGREGATE定义聚集转换状态数据的估计大小（Hadi Moshayedi） 恰当使用此功能可使规划器更好地估计聚集将使用多少内存。","title":"允许CREATE AGGREGATE定义聚集转换状态数据的估计大小","variants":[],"version":"9.4.0"},{"also_in":[],"category":"bugfix","category_label":"Bug 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EXISTS，使其在更多情况下避免对不存在对象报错","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"93386f317df396a1a4f69d4bd0412a3a","html":"\u003cp\u003e改进系统关系的标识方式（Andres Freund、Robert Haas）\u003c/p\u003e\n\u003cp\u003e此前，一旦关系被移入 \u003ccode\u003epg_catalog\u003c/code\u003e 模式，就不能再修改或删除。\u003c/p\u003e","id":"9.4.0-f38cddff6b5b08ad","identity_text":"Improve how system relations are identified (Andres Freund, Robert Haas) Previously, relations once moved into the pg_catalog schema could no longer be modified or dropped.","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"对象操作","section_path":["对象操作"],"source_commits":[],"source_entry_id":"9.4.0/changes/079","source_hash":"fa9c733000a61dc1a286e8a448a22fd343af28058d33e901b9e26163e6c9f62c","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.7","statement_hash":"235c1438346c2ac3b84d5388d63799e764b44723b0855aea2e813327f0dcbf9d","text":"改进系统关系的标识方式（Andres Freund、Robert Haas） 此前，一旦关系被移入 pg_catalog 模式，就不能再修改或删除。","title":"改进系统关系的标识方式","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"9e9dc90134e6ad791232823d94272e6b","html":"\u003cp\u003e完整实现 \u003ca href=\"/docs/9.4/datatype-geometric.html#DATATYPE-LINE\" title=\"8.8.2. 线\"\u003e\u003ccode\u003eline\u003c/code\u003e\u003c/a\u003e 数据类型（Peter Eisentraut）\u003c/p\u003e\n\u003cp\u003e线\u003cspan\u003e\u003cem\u003e段\u003c/em\u003e\u003c/span\u003e数据类型（\u003ca href=\"/docs/9.4/datatype-geometric.html#DATATYPE-LSEG\" title=\"8.8.3. 线段\"\u003e\u003ccode\u003elseg\u003c/code\u003e\u003c/a\u003e）一直得到完整支持。以前的 \u003ccode\u003eline\u003c/code\u003e 数据类型（只能通过编译时选项启用）与新实现在二进制和转储格式上不兼容。\u003c/p\u003e","id":"9.4.0-2fe57db9905f65c3","identity_text":"Fully implement the line data type (Peter Eisentraut) The line segment data type (lseg) has always been fully supported. The previous line data type (which was enabled only via a compile-time option) is not binary or dump-compatible with the new implementation.","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"数据类型","section_path":["数据类型"],"source_commits":[],"source_entry_id":"9.4.0/changes/080","source_hash":"9254a43e407b84ae0f638886c04fde301f7b55576aea2a0287da1115645e24a4","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.8","statement_hash":"fe712fe8daab22bbd350e7b79bb6a62b8c4a87a20f156141dad2695b2c1a7d05","text":"完整实现 line 数据类型（Peter Eisentraut） 线段数据类型（lseg）一直得到完整支持。以前的 line 数据类型（只能通过编译时选项启用）与新实现在二进制和转储格式上不兼容。","title":"完整实现 line 数据类型","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"1dc25c7b83268729510a062fea663287","html":"\u003cp\u003e新增 \u003ca href=\"/docs/9.4/datatype-pg-lsn.html\" title=\"8.19. pg_lsn 类型\"\u003e\u003ccode\u003epg_lsn\u003c/code\u003e\u003c/a\u003e 数据类型，用于表示 \u003cacronym\u003eWAL\u003c/acronym\u003e 日志序列号（\u003cacronym\u003eLSN\u003c/acronym\u003e）（Robert Haas、Michael Paquier）\u003c/p\u003e","id":"9.4.0-a59f891dfa449b74","identity_text":"Add pg_lsn data type to represent a WAL log sequence number (LSN) (Robert Haas, Michael Paquier)","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"数据类型","section_path":["数据类型"],"source_commits":[],"source_entry_id":"9.4.0/changes/081","source_hash":"974c0b36aff142691c79e786f788923c188f0ff770fe02dcdea2c6afd15b6561","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.8","statement_hash":"05785e43a62d758e594f07bb22faae191d78dc2337bc0c8353d2f32eb1846207","text":"新增 pg_lsn 数据类型，用于表示 WAL 日志序列号（LSN）（Robert Haas、Michael Paquier）","title":"新增 pg_lsn 数据类型，用于表示 WAL 日志序列号（LSN）","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"d61fea5ee1b6ff8df755b16c69459e05","html":"\u003cp\u003e允许把单点\u003ca href=\"/docs/9.4/datatype-geometric.html#DATATYPE-POLYGON\" title=\"8.8.6. 多边形\"\u003e\u003ccode\u003epolygon\u003c/code\u003e\u003c/a\u003e转换为\u003ca href=\"/docs/9.4/datatype-geometric.html#DATATYPE-CIRCLE\" title=\"8.8.7. 圆\"\u003e\u003ccode\u003ecircle\u003c/code\u003e\u003c/a\u003e（Bruce Momjian）\u003c/p\u003e","id":"9.4.0-fdf7f503b17828f4","identity_text":"Allow single-point polygons to be converted to circles (Bruce Momjian)","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"数据类型","section_path":["数据类型"],"source_commits":[],"source_entry_id":"9.4.0/changes/082","source_hash":"c757d7d34038f11ba75e89adf73554940437d4e49a7f0af10f78a3e41836d84f","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.8","statement_hash":"2fb35c8f002e764043840008316ec4fdc38b9682581ffd71f95fecdb9ac7584f","text":"允许把单点polygon转换为circle（Bruce Momjian）","title":"允许把单点polygon转换为circle","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"9748c3469a93c312976363e45183b404","html":"\u003cp\u003e支持随时间改变 UTC 偏移的时区缩写（Tom Lane）\u003c/p\u003e\n\u003cp\u003e此前，\u003cspan\u003ePostgreSQL\u003c/span\u003e 假定时区缩写（如 \u003ccode\u003eEST\u003c/code\u003e）关联的 UTC 偏移在任何特定区域设置的用法中永不改变。然而这一假设在现实世界中并不成立，因此引入了让区域缩写表示有时会变化的 UTC 偏移的能力。更新了时区缩写定义文件，在自 1970 年以来缩写的 UTC 偏移发生过变化的时区区域设置中使用此功能（依据 IANA 时区数据库）。在此类时区中，\u003cspan\u003ePostgreSQL\u003c/span\u003e 现在会根据给定日期为缩写关联正确的 UTC 偏移。\u003c/p\u003e","id":"9.4.0-92c22662927186de","identity_text":"Support time zone abbreviations that change UTC offset from time to time (Tom Lane) Previously, PostgreSQL assumed that the UTC offset associated with a time zone abbreviation (such as EST) never changes in the usage of any particular locale. However this assumption fails in the real world, so introduce the ability for a zone abbreviation to represent a UTC offset that sometimes changes. Update the zone abbreviation definition files to make use of this feature in timezone locales that have changed the UTC offset of their abbreviations since 1970 (according to the IANA timezone database). In such timezones, PostgreSQL will now associate the correct UTC offset with the abbreviation depending on the given date.","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"数据类型","section_path":["数据类型"],"source_commits":[],"source_entry_id":"9.4.0/changes/083","source_hash":"c580fb854e262b8d63d2f5221441fa934e981569285b648e1029ac8863a4fba5","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.8","statement_hash":"a6501e3be8faaec1aef9006ff3436c99d826569caaba0e379a16ca0000209bff","text":"支持随时间改变 UTC 偏移的时区缩写（Tom Lane） 此前，PostgreSQL 假定时区缩写（如 EST）关联的 UTC 偏移在任何特定区域设置的用法中永不改变。然而这一假设在现实世界中并不成立，因此引入了让区域缩写表示有时会变化的 UTC 偏移的能力。更新了时区缩写定义文件，在自 1970 年以来缩写的 UTC 偏移发生过变化的时区区域设置中使用此功能（依据 IANA 时区数据库）。在此类时区中，PostgreSQL 现在会根据给定日期为缩写关联正确的 UTC 偏移。","title":"支持随时间改变 UTC 偏移的时区缩写","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"7f8bfa51bef64e75678000b0117362f4","html":"\u003cp\u003e在适当情况下，允许非 \u003cacronym\u003eISO\u003c/acronym\u003e 的 \u003ca href=\"/docs/9.4/datatype-datetime.html\" title=\"8.5. 日期/时间类型\"\u003e\u003ccode\u003etimestamp\u003c/code\u003e\u003c/a\u003e 和 \u003ccode\u003edate\u003c/code\u003e 字符串使用五位及以上年份（Bruce Momjian）\u003c/p\u003e","id":"9.4.0-0c698fdbb1891a43","identity_text":"Allow 5+ digit years for non-ISO timestamp and date strings, where appropriate (Bruce Momjian)","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"数据类型","section_path":["数据类型"],"source_commits":[],"source_entry_id":"9.4.0/changes/084","source_hash":"cc16475f90c5d6ab73e41927cb986a8afb0d4ef0fd5189e96340e9495ac5264f","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.8","statement_hash":"ddad46c60eb37d3ed3bdec9cca426543d4c0bc74c6d5fb87367e7845f5c3f579","text":"在适当情况下，允许非 ISO 的 timestamp 和 date 字符串使用五位及以上年份（Bruce Momjian）","title":"在适当情况下，允许非 ISO 的 timestamp 和 date 字符串使用五位及以上年份","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"5768b1f3d23ee6552b64871f76a0e483","html":"\u003cp\u003e新增对 \u003ca href=\"/docs/9.4/datatype-datetime.html\" title=\"8.5. 日期/时间类型\"\u003e\u003ccode\u003einterval\u003c/code\u003e\u003c/a\u003e 值上溢/下溢的检查（Bruce Momjian）\u003c/p\u003e","id":"9.4.0-4aaa907294874d46","identity_text":"Add checks for overflow/underflow of interval values (Bruce Momjian)","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"数据类型","section_path":["数据类型"],"source_commits":[],"source_entry_id":"9.4.0/changes/085","source_hash":"b4365baa794f1fd3d06626dacfc06ce2a71fe43df0f294c716c5a7812c51d3b5","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.8","statement_hash":"93fbb6837692daea7c91965307573906d656e399aedf5e9e6286eaf774e25b18","text":"新增对 interval 值上溢/下溢的检查（Bruce Momjian）","title":"新增对 interval 值上溢/下溢的检查","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"c005a1586946218de524236bea2f4df3","html":"\u003cp\u003e新增 \u003ca href=\"/docs/9.4/datatype-json.html\" title=\"8.14. JSON 类型\"\u003e\u003ccode\u003ejsonb\u003c/code\u003e\u003c/a\u003e，一种存储 \u003cacronym\u003eJSON\u003c/acronym\u003e 数据的功能更强、效率更高的数据类型（Oleg Bartunov、Teodor Sigaev、Alexander Korotkov、Peter Geoghegan、Andrew Dunstan）\u003c/p\u003e\n\u003cp\u003e这种新类型允许更快地访问 JSON 文档中的值，以及对 JSON 列更快、更有用的索引。\u003ccode\u003ejsonb\u003c/code\u003e 文档中的标量值以适当的标量 SQL 类型存储，JSON 文档结构经过预解析，而不是像原来的 \u003ccode\u003ejson\u003c/code\u003e 数据类型那样以文本形式存储。\u003c/p\u003e","id":"9.4.0-2768a7674154bb20","identity_text":"Add jsonb, a more capable and efficient data type for storing JSON data (Oleg Bartunov, Teodor Sigaev, Alexander Korotkov, Peter Geoghegan, Andrew Dunstan) This new type allows faster access to values within a JSON document, and faster and more useful indexing of JSON columns. Scalar values in jsonb documents are stored as appropriate scalar SQL types, and the JSON document structure is pre-parsed rather than being stored as text as in the original json data type.","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"数据类型 / JSON","section_path":["数据类型","JSON"],"source_commits":[],"source_entry_id":"9.4.0/changes/086","source_hash":"36e84e7530cb26b93c487d6e6b560d89244d8ed6fc85861182e5dd6cde181285","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.8.3","statement_hash":"378a2dc1a3f3bca6bd3c7067d9e4d8415c69e0f08393c1a025ede56e19b8b85a","text":"新增 jsonb，一种存储 JSON 数据的功能更强、效率更高的数据类型（Oleg Bartunov、Teodor Sigaev、Alexander Korotkov、Peter Geoghegan、Andrew Dunstan） 这种新类型允许更快地访问 JSON 文档中的值，以及对 JSON 列更快、更有用的索引。jsonb 文档中的标量值以适当的标量 SQL 类型存储，JSON 文档结构经过预解析，而不是像原来的 json 数据类型那样以文本形式存储。","title":"新增 jsonb，一种存储 JSON 数据的功能更强、效率更高的数据类型","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"726b7d430fe61806cb4fc62c311677c8","html":"\u003cp\u003e新增 JSON 函数以允许构造任意复杂的 JSON 树（Andrew Dunstan、Laurence Rowe）\u003c/p\u003e\n\u003cp\u003e新函数包括 \u003ca href=\"/docs/9.4/functions-json.html#FUNCTIONS-JSON-PROCESSING-TABLE\" title=\"表 9.43. JSON 处理函数\"\u003e\u003ccode\u003ejson_array_elements_text()\u003c/code\u003e\u003c/a\u003e、\u003ccode\u003ejson_build_array()\u003c/code\u003e、\u003ccode\u003ejson_object()\u003c/code\u003e、\u003ccode\u003ejson_object_agg()\u003c/code\u003e、\u003ccode\u003ejson_to_record()\u003c/code\u003e 和 \u003ccode\u003ejson_to_recordset()\u003c/code\u003e。\u003c/p\u003e","id":"9.4.0-2a68995d6b505f3d","identity_text":"Add new JSON functions to allow for the construction of arbitrarily complex JSON trees (Andrew Dunstan, Laurence Rowe) New functions include json_array_elements_text(), json_build_array(), json_object(), json_object_agg(), json_to_record(), and json_to_recordset().","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"数据类型 / JSON","section_path":["数据类型","JSON"],"source_commits":[],"source_entry_id":"9.4.0/changes/087","source_hash":"890f10452b106fe0372fc419ad942a16bedfeb65c4ce5851a6b150f3afe45005","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.8.3","statement_hash":"d718b27459e1627d79f16424f00a40833dd7ca43367d29762b1f26a55a05e200","text":"新增 JSON 函数以允许构造任意复杂的 JSON 树（Andrew Dunstan、Laurence Rowe） 新函数包括 json_array_elements_text()、json_build_array()、json_object()、json_object_agg()、json_to_record() 和 json_to_recordset()。","title":"新增 JSON 函数以允许构造任意复杂的 JSON 树","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"5817518db294ee5bc0e0b47bc8d8806d","html":"\u003cp\u003e新增 \u003ca href=\"/docs/9.4/functions-json.html#FUNCTIONS-JSON-PROCESSING-TABLE\" title=\"表 9.43. JSON 处理函数\"\u003e\u003ccode\u003ejson_typeof()\u003c/code\u003e\u003c/a\u003e，返回 \u003ccode\u003ejson\u003c/code\u003e 值的数据类型（Andrew Tipton）\u003c/p\u003e","id":"9.4.0-c7f50bb37ad4010d","identity_text":"Add json_typeof() to return the data type of a json value (Andrew Tipton)","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"数据类型 / JSON","section_path":["数据类型","JSON"],"source_commits":[],"source_entry_id":"9.4.0/changes/088","source_hash":"13af102b346402fc56743e030092b94b892e4d5cad880edb41a2e73707d1b5bc","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.8.3","statement_hash":"e97c941e5df2614e7f64f7ab1bbaa193a1de0581fd4b7164c7241069944d9d1b","text":"新增 json_typeof()，返回 json 值的数据类型（Andrew Tipton）","title":"新增 json_typeof()，返回 json 值的数据类型","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"d709c6056c83103d28a3039334834d01","html":"\u003cp\u003e新增 \u003ca href=\"/docs/9.4/functions-datetime.html#FUNCTIONS-DATETIME-DELAY\" title=\"9.9.5. 延时执行\"\u003e\u003ccode\u003epg_sleep_for(interval)\u003c/code\u003e\u003c/a\u003e 和 \u003ccode\u003epg_sleep_until(timestamp)\u003c/code\u003e，以更灵活地指定延迟（Vik Fearing、Julien Rouhaud）\u003c/p\u003e\n\u003cp\u003e现有的 \u003ccode\u003epg_sleep()\u003c/code\u003e 函数只支持以秒为单位指定延迟。\u003c/p\u003e","id":"9.4.0-38cd9779eaf08090","identity_text":"Add pg_sleep_for(interval) and pg_sleep_until(timestamp) to specify delays more flexibly (Vik Fearing, Julien Rouhaud) The existing pg_sleep() function only supports delays specified in seconds.","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"函数","section_path":["函数"],"source_commits":[],"source_entry_id":"9.4.0/changes/089","source_hash":"2a21916c6bd38f1ec71880cce65c5855642261e38dbb2090cae0e5117d86df5f","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.9","statement_hash":"e1661f304ad7bcd7558b29cc53dcdba9532c7132f3a576db3848749a42b8bb67","text":"新增 pg_sleep_for(interval) 和 pg_sleep_until(timestamp)，以更灵活地指定延迟（Vik Fearing、Julien Rouhaud） 现有的 pg_sleep() 函数只支持以秒为单位指定延迟。","title":"新增 pg_sleep_for(interval) 和 pg_sleep_until(timestamp)，以更灵活地指定延迟","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"935fe7d88b3bbac1737cc21045fc4311","html":"\u003cp\u003e新增面向数组的 \u003ca href=\"/docs/9.4/functions-array.html#ARRAY-FUNCTIONS-TABLE\" title=\"表 9.46. 数组函数\"\u003e\u003ccode\u003ecardinality()\u003c/code\u003e\u003c/a\u003e 函数（Marko Tiikkaja）\u003c/p\u003e\n\u003cp\u003e它返回数组中元素的总数，对于没有元素的数组则返回零。\u003c/p\u003e","id":"9.4.0-62f133dca1528c9d","identity_text":"Add cardinality() function for arrays (Marko Tiikkaja) This returns the total number of elements in the array, or zero for an array with no elements.","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"函数","section_path":["函数"],"source_commits":[],"source_entry_id":"9.4.0/changes/090","source_hash":"9f16a5fd671883875ad597b75c39f688a852444072b792ba13a0af8906004820","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.9","statement_hash":"0ef70aeddf85a9e342508081e7ef65a616e260a53f869b15503fa5271987650b","text":"新增面向数组的 cardinality() 函数（Marko Tiikkaja） 它返回数组中元素的总数，对于没有元素的数组则返回零。","title":"新增面向数组的 cardinality() 函数","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"726bc75348444a9e6125a40cba7178eb","html":"\u003cp\u003e新增 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函数，允许在任意偏移处进行大对象读写","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"c3c41715155c7f51cc889501f21ad8df","html":"\u003cp\u003e允许 \u003ca href=\"/docs/9.4/functions-array.html#ARRAY-FUNCTIONS-TABLE\" title=\"表 9.46. 数组函数\"\u003e\u003ccode\u003eunnest()\u003c/code\u003e\u003c/a\u003e 接受多个参数，各参数分别展开后再水平串联（Andrew Gierth）\u003c/p\u003e","id":"9.4.0-07d942b3298a9310","identity_text":"Allow unnest() to take multiple arguments, which are individually unnested then horizontally concatenated (Andrew Gierth)","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"函数","section_path":["函数"],"source_commits":[],"source_entry_id":"9.4.0/changes/092","source_hash":"917ef426e0d2e87323d35a8e3929f5061928fcf68a9d553b312dc4231a128c19","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.9","statement_hash":"8cb1ddd53777d2cf53de21018c6121925a0aa52807e116df46ce20bc3f3bc350","text":"允许 unnest() 接受多个参数，各参数分别展开后再水平串联（Andrew Gierth）","title":"允许 unnest() 接受多个参数，各参数分别展开后再水平串联","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"fa991d84a0a82162f49e6c92f0463f40","html":"\u003cp\u003e新增从各个单独的值（而非字符串）构造 \u003ccode\u003etime\u003c/code\u003e、\u003ccode\u003edate\u003c/code\u003e、\u003ccode\u003etimestamp\u003c/code\u003e、\u003ccode\u003etimestamptz\u003c/code\u003e 和 \u003ccode\u003einterval\u003c/code\u003e 的函数（Pavel Stehule）\u003c/p\u003e\n\u003cp\u003e这些函数的名称以 \u003ccode\u003emake_\u003c/code\u003e 为前缀，例如 \u003ca href=\"/docs/9.4/functions-datetime.html#FUNCTIONS-DATETIME-TABLE\" title=\"表 9.28. 日期/时间函数\"\u003e\u003ccode\u003emake_date()\u003c/code\u003e\u003c/a\u003e。\u003c/p\u003e","id":"9.4.0-7f4342594b2293d6","identity_text":"Add functions to construct times, dates, timestamps, timestamptzs, and intervals from individual values, rather than strings (Pavel Stehule) These functions' names are prefixed with make_, e.g. make_date().","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"函数","section_path":["函数"],"source_commits":[],"source_entry_id":"9.4.0/changes/093","source_hash":"310d90df55038d61b781f20e74a90c47c541adee4405d6bf72c0c6fba80dee38","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.9","statement_hash":"0f3cae11cdb490ceb56b99eaa6935483fb7684891dc1cde8e5db71a291af76c2","text":"新增从各个单独的值（而非字符串）构造 time、date、timestamp、timestamptz 和 interval 的函数（Pavel Stehule） 这些函数的名称以 make_ 为前缀，例如 make_date()。","title":"新增从各个单独的值（而非字符串）构造 time、date、timestamp、timestamptz 和 interval 的函数","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"3cd6a7314c12fa1fa024581b84fc491f","html":"\u003cp\u003e使 \u003ca href=\"/docs/9.4/functions-formatting.html#FUNCTIONS-FORMATTING-TABLE\" title=\"表 9.21. 格式化函数\"\u003e\u003ccode\u003eto_char()\u003c/code\u003e\u003c/a\u003e 的 \u003ccode\u003eTZ\u003c/code\u003e 格式说明符对简单的数字时区偏移返回有用的值（Tom Lane）\u003c/p\u003e\n\u003cp\u003e此前，如果 \u003ccode\u003etimezone\u003c/code\u003e 被设置为类似 \u003ccode\u003e-4\u003c/code\u003e 的常量，\u003ccode\u003eto_char(CURRENT_TIMESTAMP, 'TZ')\u003c/code\u003e 会返回空字符串。\u003c/p\u003e","id":"9.4.0-8d2460daa45a5a11","identity_text":"Make to_char()'s TZ format specifier return a useful value for simple numeric time zone offsets (Tom Lane) Previously, to_char(CURRENT_TIMESTAMP, 'TZ') returned an empty string if the timezone was set to a constant like -4.","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"函数","section_path":["函数"],"source_commits":[],"source_entry_id":"9.4.0/changes/094","source_hash":"4bba0708133968aa4a7b2609d8b98bbd146ed8fefeb980211f0799c19151a56a","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.9","statement_hash":"8d242e7e4c06cd1528dca6fa1ab36c1ef7d2e2fce8dd5d0a8880f825300a7b16","text":"使 to_char() 的 TZ 格式说明符对简单的数字时区偏移返回有用的值（Tom Lane） 此前，如果 timezone 被设置为类似 -4 的常量，to_char(CURRENT_TIMESTAMP, 'TZ') 会返回空字符串。","title":"使 to_char() 的 TZ 格式说明符对简单的数字时区偏移返回有用的值","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"d4dad0b7f999759788441855cffff3bd","html":"\u003cp\u003e为 \u003ca href=\"/docs/9.4/functions-formatting.html#FUNCTIONS-FORMATTING-TABLE\" title=\"表 9.21. 格式化函数\"\u003e\u003ccode\u003eto_char()\u003c/code\u003e\u003c/a\u003e 新增时区偏移格式说明符 \u003ccode\u003eOF\u003c/code\u003e（Bruce Momjian）\u003c/p\u003e","id":"9.4.0-4a755d5017bb4716","identity_text":"Add timezone offset format specifier OF to to_char() (Bruce Momjian)","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"函数","section_path":["函数"],"source_commits":[],"source_entry_id":"9.4.0/changes/095","source_hash":"b7d5764353dd2cca1d37f3850ee608bf494e9bb54bb39c825d585db2af3150c2","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.9","statement_hash":"5964a81fa556a76b60700a144c55628d425f5ded49087df1e2e332be6294e2eb","text":"为 to_char() 新增时区偏移格式说明符 OF（Bruce Momjian）","title":"为 to_char() 新增时区偏移格式说明符 OF","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"a2305918fb87e954160819f4933e399a","html":"\u003cp\u003e改进 \u003ca href=\"/docs/9.4/functions-math.html#FUNCTIONS-MATH-RANDOM-TABLE\" title=\"表 9.4. 随机函数\"\u003e\u003ccode\u003erandom()\u003c/code\u003e\u003c/a\u003e 所用的随机种子（Honza Horak）\u003c/p\u003e","id":"9.4.0-df4c69a9a548901f","identity_text":"Improve the random seed used for random() (Honza Horak)","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"函数","section_path":["函数"],"source_commits":[],"source_entry_id":"9.4.0/changes/096","source_hash":"3786aab5337fc5a7177c2e1f03f7d2ec465ddc3106f58032a70aee0140348d0c","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.9","statement_hash":"3fd9018b8c2ab8559b7080a75d0f2906e841c6c08e637b042791d9464c95d700","text":"改进 random() 所用的随机种子（Honza Horak）","title":"改进 random() 所用的随机种子","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"2158dcf319aa4a10e69a70073fa41b8b","html":"\u003cp\u003e收紧 \u003ca href=\"/docs/9.4/functions-string.html#FUNCTIONS-STRING-OTHER\" title=\"表 9.7. 其他字符串函数\"\u003e\u003ccode\u003echr(int)\u003c/code\u003e\u003c/a\u003e 中对 Unicode 码点的有效性检查（Tom Lane）\u003c/p\u003e\n\u003cp\u003e此函数现在只接受按照 RFC 3629 是有效 UTF8 字符的值。\u003c/p\u003e","id":"9.4.0-7ac40e795e5bae6a","identity_text":"Tighten validity checking for Unicode code points in chr(int) (Tom Lane) This function now only accepts values that are valid UTF8 characters according to RFC 3629.","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"函数","section_path":["函数"],"source_commits":[],"source_entry_id":"9.4.0/changes/097","source_hash":"0dd7b4ee7b25c564e707ceef10181b3857731654bc3d96d8cf241cdb4d765787","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.9","statement_hash":"0a861a7837b92a9b576ecd7f327c390686b9d8472814be85c79f4e77c0778382","text":"收紧 chr(int) 中对 Unicode 码点的有效性检查（Tom Lane） 此函数现在只接受按照 RFC 3629 是有效 UTF8 字符的值。","title":"收紧 chr(int) 中对 Unicode 码点的有效性检查","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"4f0630f285d86fdd2cc1454179fd9476","html":"\u003cp\u003e新增在 \u003ccode\u003epg_class\u003c/code\u003e、\u003ccode\u003epg_proc\u003c/code\u003e、\u003ccode\u003epg_type\u003c/code\u003e 和 \u003ccode\u003epg_operator\u003c/code\u003e 中查找对象的函数，它们不会对不存在的对象产生错误（Yugo Nagata、Nozomi Anzai、Robert Haas）\u003c/p\u003e\n\u003cp\u003e例如，\u003ca href=\"/docs/9.4/functions-info.html#FUNCTIONS-INFO-CATALOG-TABLE\" title=\"表 9.59. 系统目录信息函数\"\u003e\u003ccode\u003eto_regclass()\u003c/code\u003e\u003c/a\u003e 类似于 \u003ccode\u003eregclass\u003c/code\u003e 输入函数在 \u003ccode\u003epg_class\u003c/code\u003e 中进行查找，但对不存在的对象返回 NULL 而不是失败。\u003c/p\u003e","id":"9.4.0-a9b9cfda01500899","identity_text":"Add functions for looking up objects in pg_class, pg_proc, pg_type, and pg_operator that do not generate errors for non-existent objects (Yugo Nagata, Nozomi Anzai, Robert Haas) For example, to_regclass() does a lookup in pg_class similarly to the regclass input function, but it returns NULL for a non-existent object instead of failing.","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"函数 / 系统信息函数","section_path":["函数","系统信息函数"],"source_commits":[],"source_entry_id":"9.4.0/changes/098","source_hash":"fa26831520f25348b02da7d57645fd3652e646565244a4876290440cc19f9509","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.9.3","statement_hash":"6d01812773bebb24340d7c44af37f9bc553e6866c0b2fecadf0b343bf4c862cb","text":"新增在 pg_class、pg_proc、pg_type 和 pg_operator 中查找对象的函数，它们不会对不存在的对象产生错误（Yugo Nagata、Nozomi Anzai、Robert Haas） 例如，to_regclass() 类似于 regclass 输入函数在 pg_class 中进行查找，但对不存在的对象返回 NULL 而不是失败。","title":"新增在 pg_class、pg_proc、pg_type 和 pg_operator 中查找对象的函数，它们不会对不存在的对象产生错误","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"8dd329313a930ba46939718fb2fb04e6","html":"\u003cp\u003e新增函数 \u003ca href=\"/docs/9.4/functions-admin.html#FUNCTIONS-ADMIN-DBLOCATION\" title=\"表 9.71. 数据库对象位置函数\"\u003e\u003ccode\u003epg_filenode_relation()\u003c/code\u003e\u003c/a\u003e，允许更高效地从文件节点查找关系名（Andres Freund）\u003c/p\u003e","id":"9.4.0-9b56e16802c10e9f","identity_text":"Add function pg_filenode_relation() to allow for more efficient lookup of relation names from filenodes (Andres Freund)","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"函数 / 系统信息函数","section_path":["函数","系统信息函数"],"source_commits":[],"source_entry_id":"9.4.0/changes/099","source_hash":"daf7f7cc7689f4c8bd51d524605809326aa856bc74358f2ec6fef976181ab8ac","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.9.3","statement_hash":"88dbf851124bb0d562c2240bfa4f6124a841269d56200eb14abcfeebe88397e4","text":"新增函数 pg_filenode_relation()，允许更高效地从文件节点查找关系名（Andres Freund）","title":"新增函数 pg_filenode_relation()，允许更高效地从文件节点查找关系名","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"e107731cc8a47517e39123f11e1b588d","html":"\u003cp\u003e为 \u003ca href=\"/docs/9.4/infoschema-parameters.html\" title=\"34.32. parameters\"\u003e\u003ccode\u003einformation_schema.parameters\u003c/code\u003e\u003c/a\u003e 视图新增 \u003ccode\u003eparameter_default\u003c/code\u003e 列（Peter Eisentraut）\u003c/p\u003e","id":"9.4.0-98c94736ce2fab5a","identity_text":"Add parameter_default column to information_schema.parameters view (Peter Eisentraut)","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"函数 / 系统信息函数","section_path":["函数","系统信息函数"],"source_commits":[],"source_entry_id":"9.4.0/changes/100","source_hash":"4f85410358dc5036f211033aae25f652511eb9aebe1f2ca7b2afbf7d6e7d3103","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.9.3","statement_hash":"f5f28d4b8ed323040c5cd4921b17eee8407407021f71c755f3cdf6de0406f0bd","text":"为 information_schema.parameters 视图新增 parameter_default 列（Peter Eisentraut）","title":"为 information_schema.parameters 视图新增 parameter_default 列","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"a1e247eed38fa99b63b18eb8d91cb212","html":"\u003cp\u003e使 \u003ca href=\"/docs/9.4/infoschema-schemata.html\" title=\"34.41. schemata\"\u003e\u003ccode\u003einformation_schema.schemata\u003c/code\u003e\u003c/a\u003e 显示所有可访问的模式（Peter Eisentraut）\u003c/p\u003e\n\u003cp\u003e此前它只显示当前用户拥有的模式。\u003c/p\u003e","id":"9.4.0-4cae88af306060f8","identity_text":"Make information_schema.schemata show all accessible schemas (Peter Eisentraut) Previously it only showed schemas owned by the current user.","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"函数 / 系统信息函数","section_path":["函数","系统信息函数"],"source_commits":[],"source_entry_id":"9.4.0/changes/101","source_hash":"686f23b7c21ff1dd8caca72587f204a6ba98e36b87a3de585c69fceecb189a65","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.9.3","statement_hash":"db1264117e55210780b87120b4b7f63aee5eca519e6044f4f9334135e87ac7e0","text":"使 information_schema.schemata 显示所有可访问的模式（Peter Eisentraut） 此前它只显示当前用户拥有的模式。","title":"使 information_schema.schemata 显示所有可访问的模式","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"6177fad2f9762cc4db8d015dee61f685","html":"\u003cp\u003e通过 \u003ca href=\"/docs/9.4/sql-expressions.html#SYNTAX-AGGREGATES\" title=\"4.2.7. 聚合表达式\"\u003e\u003ccode\u003eFILTER\u003c/code\u003e\u003c/a\u003e 子句控制哪些行被传递给聚集函数（David Fetter）\u003c/p\u003e","id":"9.4.0-6f4fa3474888e2dc","identity_text":"Add control over which rows are passed into aggregate functions via the FILTER clause (David Fetter)","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"函数 / 聚合","section_path":["函数","聚合"],"source_commits":[],"source_entry_id":"9.4.0/changes/102","source_hash":"60b9327318a6520aca80ebe660e65e6abc23fe6c532ef55b691e3891891e97e5","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.9.4","statement_hash":"dd418aa1c2469092a39057f243180fac6e3f75750ddf857c3dc262442e6f197b","text":"通过 FILTER 子句控制哪些行被传递给聚集函数（David Fetter）","title":"通过 FILTER 子句控制哪些行被传递给聚集函数","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"dcbb81a9b1f68b4d97be83e9af660b11","html":"\u003cp\u003e支持有序集（\u003ca href=\"/docs/9.4/sql-expressions.html#SYNTAX-AGGREGATES\" title=\"4.2.7. 聚合表达式\"\u003e\u003ccode\u003eWITHIN GROUP\u003c/code\u003e\u003c/a\u003e）聚集（Atri Sharma、Andrew Gierth、Tom Lane）\u003c/p\u003e","id":"9.4.0-189597fa868bfb30","identity_text":"Support ordered-set (WITHIN GROUP) aggregates (Atri Sharma, Andrew Gierth, Tom Lane)","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"函数 / 聚合","section_path":["函数","聚合"],"source_commits":[],"source_entry_id":"9.4.0/changes/103","source_hash":"9583c24056287c698bcc4480a9c61cef012061647a0b09a342233b2b41e3d845","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.9.4","statement_hash":"d7b18af36efee53af1759257991e07415c00ca38c342f1ead6fe4f5b6abb99d7","text":"支持有序集（WITHIN GROUP）聚集（Atri Sharma、Andrew Gierth、Tom Lane）","title":"支持有序集（WITHIN GROUP）聚集","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"24e9cacfc9e86d5ca6beb29023469e01","html":"\u003cp\u003e新增标准有序集聚集 \u003ca href=\"/docs/9.4/functions-aggregate.html#FUNCTIONS-ORDEREDSET-TABLE\" title=\"表 9.51. 有序集聚合函数\"\u003e\u003ccode\u003epercentile_cont()\u003c/code\u003e\u003c/a\u003e、\u003ccode\u003epercentile_disc()\u003c/code\u003e、\u003ccode\u003emode()\u003c/code\u003e、\u003ca href=\"/docs/9.4/functions-aggregate.html#FUNCTIONS-HYPOTHETICAL-TABLE\" title=\"表 9.52. 假想集聚合函数\"\u003e\u003ccode\u003erank()\u003c/code\u003e\u003c/a\u003e、\u003ccode\u003edense_rank()\u003c/code\u003e、\u003ccode\u003epercent_rank()\u003c/code\u003e 和 \u003ccode\u003ecume_dist()\u003c/code\u003e（Atri Sharma、Andrew Gierth）\u003c/p\u003e","id":"9.4.0-923329fe162c85e4","identity_text":"Add standard ordered-set aggregates percentile_cont(), percentile_disc(), mode(), rank(), dense_rank(), percent_rank(), and cume_dist() (Atri Sharma, Andrew Gierth)","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"函数 / 聚合","section_path":["函数","聚合"],"source_commits":[],"source_entry_id":"9.4.0/changes/104","source_hash":"c48910e2a62311ca6cd36131b3d1d4988efff355c15927f4951c32a82dd2dfeb","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.9.4","statement_hash":"8078b102eadca22282d992e4e5def7888fb3bed82b663959b4397ba7c28577eb","text":"新增标准有序集聚集 percentile_cont()、percentile_disc()、mode()、rank()、dense_rank()、percent_rank() 和 cume_dist()（Atri Sharma、Andrew Gierth）","title":"新增标准有序集聚集 percentile_cont()、percentile_disc()、mode()、rank()、dense_rank()、percent_rank() 和 cume_dist()","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"a1fc4365390bf56a216e06968955c0d3","html":"\u003cp\u003e支持 \u003ca href=\"/docs/9.4/xfunc-sql.html#XFUNC-SQL-VARIADIC-FUNCTIONS\" title=\"35.4.5. 带有可变数量参数的SQL函数\"\u003e\u003ccode\u003eVARIADIC\u003c/code\u003e\u003c/a\u003e 聚集函数（Tom Lane）\u003c/p\u003e","id":"9.4.0-b170214d59335ac7","identity_text":"Support VARIADIC aggregate functions (Tom Lane)","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"函数 / 聚合","section_path":["函数","聚合"],"source_commits":[],"source_entry_id":"9.4.0/changes/105","source_hash":"a9641bd6a27b6875f7cf377ab79b69507a10161bfc1b535436636028d26bc5f2","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.9.4","statement_hash":"4f4e973ded498088a5a3326eaafb6d847cc5c637fd8ad0a41eee97c28bd10dfd","text":"支持 VARIADIC 聚集函数（Tom Lane）","title":"支持 VARIADIC 聚集函数","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"6f26b910f15b33678c1cd2d394fdc4ed","html":"\u003cp\u003e允许多态聚集具有非多态的状态数据类型（Tom Lane）\u003c/p\u003e\n\u003cp\u003e这使得可以在 SQL 中正确声明诸如内置聚集 \u003ccode\u003earray_agg()\u003c/code\u003e 之类的聚集。\u003c/p\u003e","id":"9.4.0-6c294005b3b33557","identity_text":"Allow polymorphic aggregates to have non-polymorphic state data types (Tom Lane) This allows proper declaration in SQL of aggregates like the built-in aggregate array_agg().","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"函数 / 聚合","section_path":["函数","聚合"],"source_commits":[],"source_entry_id":"9.4.0/changes/106","source_hash":"bdeba48b403e511bbab90c813b9e61038244f66e369022620276cc1d97aa0242","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.9.4","statement_hash":"de7b59fba06391288a76993566b1c4f1cd8355b43b044ae846bde287e1f6597d","text":"允许多态聚集具有非多态的状态数据类型（Tom Lane） 这使得可以在 SQL 中正确声明诸如内置聚集 array_agg() 之类的聚集。","title":"允许多态聚集具有非多态的状态数据类型","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"4816a35550bbff8af48150c516329319","html":"\u003cp\u003e为 \u003ca href=\"/docs/9.4/plperl.html\" title=\"第 42 章 PL/Perl - Perl 过程语言\"\u003ePL/Perl\u003c/a\u003e 和 \u003ca href=\"/docs/9.4/pltcl.html\" title=\"第 41 章 PL/Tcl - Tcl 过程语言\"\u003ePL/Tcl\u003c/a\u003e 新增事件触发器支持（Dimitri Fontaine）\u003c/p\u003e","id":"9.4.0-5ab5f781a218ffa6","identity_text":"Add event trigger support to PL/Perl and PL/Tcl (Dimitri Fontaine)","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"服务器端语言","section_path":["服务器端语言"],"source_commits":[],"source_entry_id":"9.4.0/changes/107","source_hash":"e08aed9c505779446cf325f5bd00807a99e0a3cb693cf59d0b9d229d1141e329","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.10","statement_hash":"dc113e6122b921871494e2725b053be2c2d3e48d8ac1660397fef345a10eeb40","text":"为 PL/Perl 和 PL/Tcl 新增事件触发器支持（Dimitri Fontaine）","title":"为 PL/Perl 和 PL/Tcl 新增事件触发器支持","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"e762a68058360d59d5721a69eeaf5bbb","html":"\u003cp\u003e在 \u003ca href=\"/docs/9.4/plpython.html\" title=\"第 43 章 PL/Python - Python 过程语言\"\u003ePL/Python\u003c/a\u003e 中把 \u003ca href=\"/docs/9.4/datatype.html#DATATYPE-NUMERIC\" title=\"8.1. 数字类型\"\u003e\u003ccode\u003enumeric\u003c/code\u003e\u003c/a\u003e 值转换为 \u003ccode\u003edecimal\u003c/code\u003e（Szymon Guz、Ronan Dunklau）\u003c/p\u003e\n\u003cp\u003e此前此类值被转换为 Python 的 \u003ccode\u003efloat\u003c/code\u003e 值，有损失精度的风险。\u003c/p\u003e","id":"9.4.0-c5cf491b30a60161","identity_text":"Convert numeric values to decimal in PL/Python (Szymon Guz, Ronan Dunklau) Previously such values were converted to Python float values, risking loss of precision.","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"服务器端语言","section_path":["服务器端语言"],"source_commits":[],"source_entry_id":"9.4.0/changes/108","source_hash":"48afebfeb55b1e3b0bd937111c92a0e61954f5687bdc3e87db425cebb7a9a07b","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.10","statement_hash":"623038090b272e7bc328b36ddaf89708d321d47bfee14a41ba4928ad312bf47d","text":"在 PL/Python 中把 numeric 值转换为 decimal（Szymon Guz、Ronan Dunklau） 此前此类值被转换为 Python 的 float 值，有损失精度的风险。","title":"在 PL/Python 中把 numeric 值转换为 decimal","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"2cec84dbf0652d810fce1d3cc35a94d2","html":"\u003cp\u003e新增使用 \u003ca href=\"/docs/9.4/plpgsql-control-structures.html#PLPGSQL-CALL-STACK\" title=\"40.6.7. 获得执行位置信息\"\u003e\u003ccode\u003eGET DIAGNOSTICS\u003c/code\u003e\u003c/a\u003e 获取当前 PL/pgSQL 调用栈的能力（Pavel Stehule、Stephen Frost）\u003c/p\u003e","id":"9.4.0-2dd73da05944be8f","identity_text":"Add ability to retrieve the current PL/pgSQL call stack using GET DIAGNOSTICS (Pavel Stehule, Stephen Frost)","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"服务器端语言 / PL/pgSQL Server-Side Language","section_path":["服务器端语言","PL/pgSQL Server-Side 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to display the parameters passed to a query that violated a STRICT constraint (Marko Tiikkaja)","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"服务器端语言 / PL/pgSQL Server-Side Language","section_path":["服务器端语言","PL/pgSQL Server-Side Language"],"source_commits":[],"source_entry_id":"9.4.0/changes/110","source_hash":"99716033948f92258af0920607e0c48f154850c50841ba149904c821b8a10cd9","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.10.3","statement_hash":"ba228339ad96bc46f66054f149ffb473c7b928d840ddefb4d6f1635946965810","text":"新增选项 print_strict_params，用于显示传递给违反 STRICT 约束的查询的参数（Marko Tiikkaja）","title":"新增选项 print_strict_params，用于显示传递给违反 STRICT 约束的查询的参数","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"1d0f9a9e876b666a395aba71b0ed6817","html":"\u003cp\u003e新增变量 \u003ca href=\"/docs/9.4/plpgsql-development-tips.html#PLPGSQL-EXTRA-CHECKS\" title=\"40.11.2. 额外的编译时检查\"\u003e\u003ccode\u003eplpgsql.extra_warnings\u003c/code\u003e\u003c/a\u003e 和 \u003ccode\u003eplpgsql.extra_errors\u003c/code\u003e，用于启用额外的 PL/pgSQL 警告和错误（Marko Tiikkaja、Petr Jelinek）\u003c/p\u003e\n\u003cp\u003e目前只有关于被遮蔽变量的警告/错误可用。\u003c/p\u003e","id":"9.4.0-d9f9a822d1d71d9f","identity_text":"Add variables plpgsql.extra_warnings and plpgsql.extra_errors to enable additional PL/pgSQL warnings and errors (Marko Tiikkaja, Petr Jelinek) Currently only warnings/errors about shadowed variables are available.","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"服务器端语言 / PL/pgSQL Server-Side Language","section_path":["服务器端语言","PL/pgSQL Server-Side 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NULL。\u003c/p\u003e","id":"9.4.0-ec3c275eac2f6d1f","identity_text":"Make libpq's PQconndefaults() function ignore invalid service files (Steve Singer, Bruce Momjian) Previously it returned NULL if an incorrect service file was encountered.","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"libpq","section_path":["libpq"],"source_commits":[],"source_entry_id":"9.4.0/changes/112","source_hash":"a9ed2919c0ce8b3ff624a04dcc6e7ed7e2a7111a11c30f4456118716464cb218","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.11","statement_hash":"1a036dcca0309f854b2524ec10645ac9c4af523dac6de47cc65bd83241fdb686","text":"使 libpq 的 PQconndefaults() 函数忽略无效的服务文件（Steve Singer、Bruce Momjian） 此前它遇到不正确的服务文件时会返回 NULL。","title":"使 libpq 的 PQconndefaults() 函数忽略无效的服务文件","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"dbd6204e46d640f177e8b106555f2cab","html":"\u003cp\u003elibpq 接受 \u003ccode\u003eTLSv1\u003c/code\u003e 之外的 \u003cacronym\u003eTLS\u003c/acronym\u003e 协议版本（Marko Kreen）\u003c/p\u003e","id":"9.4.0-f51e78bdec50711f","identity_text":"Accept TLS protocol versions beyond TLSv1 in libpq (Marko Kreen)","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"libpq","section_path":["libpq"],"source_commits":[],"source_entry_id":"9.4.0/changes/113","source_hash":"2548e60062be3de70d979245e84d4155592c6f303f78158d9a9641200ac6d435","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.11","statement_hash":"eba7b3dfc058b3876a9bef47880928362c6e82d701b833fa5dd048ba497726c8","text":"libpq 接受 TLSv1 之外的 TLS 协议版本（Marko Kreen）","title":"libpq 接受 TLSv1 之外的 TLS 协议版本","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"da7647b4fd06ed23746eefb8c9fd5265","html":"\u003cp\u003e为\u003ca href=\"/docs/9.4/app-createuser.html\" title=\"createuser\"\u003e\u003cspan\u003e\u003cspan\u003ecreateuser\u003c/span\u003e\u003c/span\u003e\u003c/a\u003e新增选项 \u003ccode\u003e-g\u003c/code\u003e，用于指定角色成员关系（Christopher Browne）\u003c/p\u003e","id":"9.4.0-9b4ad3f71dd9475b","identity_text":"Add APP-CREATEUSER option -g to specify role membership (Christopher Browne)","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"客户端应用程序","section_path":["客户端应用程序"],"source_commits":[],"source_entry_id":"9.4.0/changes/114","source_hash":"6585b0c87012d6d0e2820fdbe6c5b78cb393b75ac0cabb60c6cc28a97a3fcc32","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.12","statement_hash":"d6770d5c68e130cfb20cf2bd6472564b43280aa56799399291b1a9644ca7091e","text":"为createuser新增选项 -g，用于指定角色成员关系（Christopher Browne）","title":"为createuser新增选项 -g，用于指定角色成员关系","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"3a4cd46ff8e39e481d7ddaeafa9f8a3e","html":"\u003cp\u003e为\u003ca href=\"/docs/9.4/app-vacuumdb.html\" title=\"vacuumdb\"\u003e\u003cspan\u003e\u003cspan\u003evacuumdb\u003c/span\u003e\u003c/span\u003e\u003c/a\u003e新增选项 \u003ccode\u003e--analyze-in-stages\u003c/code\u003e，按粒度递增的分阶段方式进行分析（Peter Eisentraut）\u003c/p\u003e\n\u003cp\u003e这允许快速创建最基本的统计信息。\u003c/p\u003e","id":"9.4.0-433b1999e61bdfb0","identity_text":"Add APP-VACUUMDB option --analyze-in-stages to analyze in stages of increasing granularity (Peter Eisentraut) This allows minimal statistics to be created quickly.","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"客户端应用程序","section_path":["客户端应用程序"],"source_commits":[],"source_entry_id":"9.4.0/changes/115","source_hash":"5d224faeea48800adad1e01513bf6d1c5c3f8d99a04519ef393a92ddd58210a8","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.12","statement_hash":"09e874eb86f5df0ba36fa7fa0a8d72755ee03e01392cc263545422d54bb5d6cb","text":"为vacuumdb新增选项 --analyze-in-stages，按粒度递增的分阶段方式进行分析（Peter Eisentraut） 这允许快速创建最基本的统计信息。","title":"为vacuumdb新增选项 --analyze-in-stages，按粒度递增的分阶段方式进行分析","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"b73fe8f0c0b690a95bcfaf75ed759deb","html":"\u003cp\u003e使带选项 \u003ccode\u003e-n\u003c/code\u003e 的\u003ca href=\"/docs/9.4/app-pgresetxlog.html\" title=\"pg_resetxlog\"\u003e\u003cspan\u003e\u003cspan\u003epg_resetxlog\u003c/span\u003e\u003c/span\u003e\u003c/a\u003e输出当前值和可能被更改的值（Rajeev Rastogi）\u003c/p\u003e","id":"9.4.0-bed2e46627b49229","identity_text":"Make APP-PGRESETXLOG with option -n output current and potentially changed values (Rajeev 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协议版本","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"6ec05019af7e1c7969bee2ec905d2f84","html":"\u003cp\u003e为 \u003ccode\u003e\\pset\u003c/code\u003e 新增 Tab 补全（Pavel Stehule）\u003c/p\u003e","id":"9.4.0-c6920bee8df72aef","identity_text":"Add tab completion for \\pset (Pavel Stehule)","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"客户端应用程序 / psql / 反斜线命令","section_path":["客户端应用程序","psql","反斜线命令"],"source_commits":[],"source_entry_id":"9.4.0/changes/132","source_hash":"d25113196db8555999ae859ef738c4d31aff151497ca6592945667770a1237a7","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.12.3.3","statement_hash":"ec966efd890c226c24066fccb249420ecc80eab46248910906a407b6e1a6c432","text":"为 \\pset 新增 Tab 补全（Pavel Stehule）","title":"为 \\pset 新增 Tab 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被多次指定","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"59b35cbb49b3b7546837a78e218a9502","html":"\u003cp\u003e可选地为还原期间删除旧对象时发出的 \u003ccode\u003eDROP\u003c/code\u003e 命令添加 \u003ccode\u003eIF EXISTS\u003c/code\u003e 子句（Pavel Stehule）\u003c/p\u003e\n\u003cp\u003e此变更避免在删除旧对象时出现不必要的错误。\u003ca href=\"/docs/9.4/app-pgdump.html\" title=\"pg_dump\"\u003e\u003cspan\u003epg_dump\u003c/span\u003e\u003c/a\u003e、\u003ca href=\"/docs/9.4/app-pg-dumpall.html\" title=\"pg_dumpall\"\u003e\u003cspan\u003e\u003cspan\u003epg_dumpall\u003c/span\u003e\u003c/span\u003e\u003c/a\u003e和\u003ca href=\"/docs/9.4/app-pgrestore.html\" title=\"pg_restore\"\u003e\u003cspan\u003epg_restore\u003c/span\u003e\u003c/a\u003e的新选项 \u003ccode\u003e--if-exists\u003c/code\u003e 只有在同时指定了 \u003ccode\u003e--clean\u003c/code\u003e 时才可用。\u003c/p\u003e","id":"9.4.0-c952cff2b7af579a","identity_text":"Optionally add IF EXISTS clauses to the DROP commands emitted when removing old objects during a restore (Pavel Stehule) This change prevents unnecessary errors when removing old objects. The new --if-exists option for APP-PGDUMP , APP-PG-DUMPALL , and APP-PGRESTORE is only available when --clean is also specified.","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"客户端应用程序 / pg_dump","section_path":["客户端应用程序","pg_dump"],"source_commits":[],"source_entry_id":"9.4.0/changes/136","source_hash":"cb37e8e2bbab73b866e1f933d74b98f98390fbe17c5b39fe485a9485f0dda76b","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.12.4","statement_hash":"153f58280fdc2bd08a8b142e31d883e0c4c0c1979f6d39f541c61ee2c4138f8a","text":"可选地为还原期间删除旧对象时发出的 DROP 命令添加 IF EXISTS 子句（Pavel Stehule） 此变更避免在删除旧对象时出现不必要的错误。pg_dump、pg_dumpall和pg_restore的新选项 --if-exists 只有在同时指定了 --clean 时才可用。","title":"可选地为还原期间删除旧对象时发出的 DROP 命令添加 IF EXISTS 子句","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"6353b2d6511c5824d904e111a0d556d3","html":"\u003cp\u003e新增 \u003cspan\u003epg_basebackup\u003c/span\u003e 选项 \u003ccode\u003e--xlogdir\u003c/code\u003e，用于指定 \u003ccode\u003epg_xlog\u003c/code\u003e 目录的位置（Haribabu Kommi）\u003c/p\u003e","id":"9.4.0-cf2bf7574a7b2387","identity_text":"Add pg_basebackup option --xlogdir to specify the pg_xlog directory location (Haribabu Kommi)","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"客户端应用程序 / pg_basebackup","section_path":["客户端应用程序","pg_basebackup"],"source_commits":[],"source_entry_id":"9.4.0/changes/137","source_hash":"c2a86bf98707629f4c50ba109d04759543ff4a2c9dc4d64843b97078b5bef983","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.12.5","statement_hash":"226fec5a6e52220d309be06ce4c2037224930867c0bb9ce8b321ed0b1a910194","text":"新增 pg_basebackup 选项 --xlogdir，用于指定 pg_xlog 目录的位置（Haribabu Kommi）","title":"新增 pg_basebackup 选项 --xlogdir，用于指定 pg_xlog 目录的位置","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"a30dcc383ef86b5d1780761ff4353a4c","html":"\u003cp\u003e允许 \u003cspan\u003epg_basebackup\u003c/span\u003e 在备份副本中重定位表空间（Steeve Lennmark）\u003c/p\u003e\n\u003cp\u003e这对于在与主库相同的机器上使用 \u003cspan\u003epg_basebackup\u003c/span\u003e 特别有用。\u003c/p\u003e","id":"9.4.0-6d93eb452378ec43","identity_text":"Allow pg_basebackup to relocate tablespaces in the backup copy (Steeve Lennmark) This is particularly useful for using pg_basebackup on the same machine as the primary.","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"客户端应用程序 / pg_basebackup","section_path":["客户端应用程序","pg_basebackup"],"source_commits":[],"source_entry_id":"9.4.0/changes/138","source_hash":"7b6f2ddf220b1e71b3af2c3789da03df6f94121df137e3f0471cb8ccb8b3da56","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.12.5","statement_hash":"c41e6be3b91616ae0897470d7c79542294631df858213d39030b10f79b4badc7","text":"允许 pg_basebackup 在备份副本中重定位表空间（Steeve Lennmark） 这对于在与主库相同的机器上使用 pg_basebackup 特别有用。","title":"允许 pg_basebackup 在备份副本中重定位表空间","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"a313cb047d5b5e9682daf1720065dbea","html":"\u003cp\u003e允许对网络流基础备份进行限速（Antonin Houska）\u003c/p\u003e\n\u003cp\u003e这可以通过 \u003cspan\u003epg_basebackup\u003c/span\u003e 的 \u003ccode\u003e--max-rate\u003c/code\u003e 参数控制。\u003c/p\u003e","id":"9.4.0-595f5575faf9686c","identity_text":"Allow network-stream base backups to be throttled (Antonin Houska) This can be controlled with the pg_basebackup --max-rate parameter.","part":"changes","patch_ids":[],"related_changes":[],"relations":[],"section":"客户端应用程序 / pg_basebackup","section_path":["客户端应用程序","pg_basebackup"],"source_commits":[],"source_entry_id":"9.4.0/changes/139","source_hash":"8a840a42695c8699b908a9d6419c871d3fb7445bcc51ebd1db77021aa7c35054","source_url":"/docs/release/9.4.0/#id-1.11.6.31.5.12.5","statement_hash":"ae2e25188d8d73478d544c190ba7794e510d4858e9a427bf49c67acb1d51caf2","text":"允许对网络流基础备份进行限速（Antonin Houska） 这可以通过 pg_basebackup 的 --max-rate 参数控制。","title":"允许对网络流基础备份进行限速","variants":[],"version":"9.4.0"},{"also_in":[],"category":"feature","category_label":"Features","commit_aliases":[],"commit_groups":[],"commits":[],"cves":[],"db_id":"41e5ddb2d68757b9744c73533dce4115","html":"\u003cp\u003e改进元组冻结方式以保留取证信息（Robert Haas、Andres Freund）\u003c/p\u003e\n\u003cp\u003e此变更消除了尽快冻结元组的主要障碍。检查元组标志位的代码将需要修改。\u003c/p\u003e","id":"9.4.0-f26a3144f58e943d","identity_text":"Improve the way tuples are frozen to preserve forensic information (Robert Haas, Andres Freund) This change removes the main objection to freezing tuples as soon as possible. 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title=\"pg_dumpall\"\u003e\u003cspan\u003e\u003cspan\u003epg_dumpall\u003c/span\u003e\u003c/span\u003e\u003c/a\u003e进行转储/恢复，或使用\u003ca href=\"/docs/9.4/pgupgrade.html\" title=\"pg_upgrade\"\u003e\u003cspan\u003e\u003cspan\u003epg_upgrade\u003c/span\u003e\u003c/span\u003e\u003c/a\u003e。\u003c/p\u003e\n\u003cp\u003e版本 9.4 包含许多可能影响与以前版本兼容性的变更。请注意以下不兼容之处：\u003c/p\u003e\n\u003cdiv\u003e\n\u003c/div\u003e","minor":0,"placeholder":false,"source_as_of":"","source_url":"/docs/release/9.4.0/","status":"stable","status_label":"Historical","support_days":-2433,"supported":false,"version":"9.4.0"}],"mode":"release","release_count":1,"remaining_cves":[],"security_as_of":"2026-09-26","security_regressions":[],"source_as_of":"2026-09-26","stats":[{"count":211,"key":"all","label":"All changes"},{"count":171,"key":"feature","label":"Features"},{"count":6,"key":"bugfix","label":"Bug 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title=\"pg_upgrade\"\u003e\u003cspan\u003e\u003cspan\u003epg_upgrade\u003c/span\u003e\u003c/span\u003e\u003c/a\u003e。\u003c/p\u003e\n\u003cp\u003e版本 9.4 包含许多可能影响与以前版本兼容性的变更。请注意以下不兼容之处：\u003c/p\u003e\n\u003cdiv\u003e\n\u003c/div\u003e","minor":0,"placeholder":false,"source_as_of":"","source_url":"/docs/release/9.4.0/","status":"stable","status_label":"Historical","support_days":-2433,"supported":false,"version":"9.4.0"},"total":211,"warnings":[]}