{"Entry":{"collection":"sqlstate","key":"2202E","name":"2202E","aliases":["ERRCODE_ARRAY_ELEMENT_ERROR"],"metadata":{"aliases":["ERRCODE_ARRAY_ELEMENT_ERROR"],"case_count":1,"class_code":"22","condition_name":"array_subscript_error","condition_names":["array_subscript_error"],"content_hash":"f2b1624f3287d115fd08f150763a2f59bc4a210f737bb64b0ba153cb29c205a6","depth":"full","editorial_review":"reviewed","evidence_tier":"observed_runtime","imported_at":"2026-09-30T17:45:27.071148+08:00","introduced":null,"known_present_by":"7.4","macros":["ERRCODE_ARRAY_ELEMENT_ERROR","ERRCODE_ARRAY_SUBSCRIPT_ERROR"],"name_zh":"数组下标错误","present_in":["9.0","9.1","9.2","9.3","9.4","9.5","9.6","10","11","12","13","14","15","16","17","18","19"],"preview_in":["19"],"primary_macro":"ERRCODE_ARRAY_SUBSCRIPT_ERROR","removed":null,"runtime_verification":"passed","severity_classes":["E"],"snippet_count":1,"source_rev":"english-manuals:c2540537867663a348ed74978e2f14d64fb4dc6fbb0f1b5d2eced9085e906c15","sqlstate":"2202E","status":"active","summary_zh":"数组下标或维度错误，如拼接维度不兼容。"}},"Definition":{"Collection":"sqlstate","Key":"2202E","SourceDatabase":"center","Version":"18","SourceTable":"sqlstate","SourceKey":"2202E","SourceRevision":"english-manuals:c2540537867663a348ed74978e2f14d64fb4dc6fbb0f1b5d2eced9085e906c15","Facts":{"aliases":[],"class_name":"Data Exception","condition_name":"array_subscript_error","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"56dacf78e618ff0fd8c533e05db597b80d7ebbad7f8e512a888217d0640aa328","slug":"18"},"lang":"en","sqlstate":"2202E"},"ManualEvidence":{"doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"56dacf78e618ff0fd8c533e05db597b80d7ebbad7f8e512a888217d0640aa328","slug":"18"}},"MeasuredEvidence":{}},"Text":{"Collection":"sqlstate","Key":"2202E","SourceDatabase":"center","Version":"","Locale":"zh-Hans","Title":"2202E — array_subscript_error（数组下标错误）","Summary":"数组下标或维度错误，如拼接维度不兼容。","BodyHTML":"\u003ch2\u003e速览 {#at-a-glance}\u003c/h2\u003e\n\u003cp\u003e\u003ccode\u003e2202E\u003c/code\u003e 是类别 22 \u003ccode\u003eData Exception\u003c/code\u003e 中的 \u003ccode\u003earray_subscript_error\u003c/code\u003e 条件。目录同时保留 \u003ccode\u003eERRCODE_ARRAY_ELEMENT_ERROR\u003c/code\u003e 这一兼容别名，并使用 \u003ccode\u003eERRCODE_ARRAY_SUBSCRIPT_ERROR\u003c/code\u003e 作为带条件名的宏。两个宏编码的是同一个 SQLSTATE。\u003c/p\u003e\n\u003cp\u003e不要把所有看起来越界的表达式都当成错误。PostgreSQL 文档明确说明，读取当前边界之外的数组下标会返回 \u003ccode\u003eNULL\u003c/code\u003e；提供错误数量的下标同样返回 \u003ccode\u003eNULL\u003c/code\u003e。数组切片还有独立的历史规则：完全位于边界外的切片可以产生空的零维数组，部分重叠的切片则缩减为重叠部分。\u003c/p\u003e\n\u003cp\u003e当其他路径校验形状或下标并拒绝它时才会抛出 \u003ccode\u003e2202E\u003c/code\u003e。核心源码中的这类路径包括数组拼接或构造时维度不兼容、无效切片边界，以及部分带下标赋值检查。诊断时，操作本身和下标数值同样重要。\u003c/p\u003e\n\u003cp\u003e可执行的代表性案例是 \u003ccode\u003eincompatible_array_dimensions\u003c/code\u003e。它在 PostgreSQL 18.6 和 10.21 上均通过：不兼容的拼接抛出 \u003ccode\u003e2202E\u003c/code\u003e，随后同一自动提交连接保持 \u003ccode\u003eIDLE\u003c/code\u003e，并成功执行有效的后续拼接。下面的 SQL 摘录是共享注册表中的完整有序语句对；测试执行器仍是建表和清理的唯一来源。\u003c/p\u003e\n\u003ch2\u003e含义与触发路径 {#meaning}\u003c/h2\u003e\n\u003cp\u003e18.6 目录中的定义是类别 22 下的 \u003ccode\u003e2202E E ERRCODE_ARRAY_SUBSCRIPT_ERROR array_subscript_error\u003c/code\u003e。前面的别名行是 \u003ccode\u003e2202E E ERRCODE_ARRAY_ELEMENT_ERROR\u003c/code\u003e；源码注释解释 SQL99 的 “array element error” 实际上就是数组下标错误。因此，仍使用别名的代码指向同一 SQLSTATE，而不是另一种条件。\u003c/p\u003e\n\u003cp\u003e数组具有秩、每个维度的长度以及下界。PostgreSQL 不要求数组从 1 开始，所以诊断时应读取实际下界，而不是作这个假设。文档中的 \u003ccode\u003earray_ndims\u003c/code\u003e、\u003ccode\u003earray_dims\u003c/code\u003e、\u003ccode\u003earray_lower\u003c/code\u003e、\u003ccode\u003earray_upper\u003c/code\u003e 和 \u003ccode\u003ecardinality\u003c/code\u003e 函数可以查看所需的元数据。需要诊断错误时，应在同一会话中实际调用这些检查函数；它们是检查工具，不代表已经触发了某个特定错误。\u003c/p\u003e\n\u003cp\u003e核心路径主要包括：\u003c/p\u003e\n\u003col\u003e\n\u003cli\u003e\u003cstrong\u003e数组元素或切片赋值。\u003c/strong\u003e \u003ccode\u003earrayfuncs.c\u003c/code\u003e 会校验下标和切片边界。一维数组可以通过给新元素赋值来扩展，中间位置填入 \u003ccode\u003eNULL\u003c/code\u003e；多维数组不支持这种扩展。给空数组赋切片时必须提供两个边界。因此，赋值访问当前读取边界之外的位置时，应按赋值操作分析，不能从 \u003ccode\u003eSELECT a[n]\u003c/code\u003e 的结果推断。\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003e数组拼接。\u003c/strong\u003e 当同秩数组的非拼接维度的长度或下界不同时，\u003ccode\u003earray_cat\u003c/code\u003e 抛出 \u003ccode\u003e2202E\u003c/code\u003e。代表性案例覆盖的就是这条路径。\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003e多维构造。\u003c/strong\u003e 表达式执行器在用于构造多维数组的非空数组表达式维度不兼容时，也会抛出同一条件。\u003c/li\u003e\n\u003c/ol\u003e\n\u003cp\u003e源码中还存在其他调用方，包括数据类型辅助路径。类别 22 是宽泛的数据异常类别；具体是哪个形状或下标契约失败，要由 \u003ccode\u003e2202E\u003c/code\u003e 条目、源码函数和报文共同确定。\u003c/p\u003e\n\u003ch2\u003e报文与诊断 {#messages}\u003c/h2\u003e\n\u003cp\u003e可执行摘录如下：\u003c/p\u003e\n\u003cpre\u003e\u003ccode\u003eSELECT ARRAY[[1,2]] || ARRAY[[3]];\nSELECT ARRAY[1,2] || ARRAY[3,4];\n\u003c/code\u003e\u003c/pre\u003e\n\u003cp\u003e第一条语句的两个二维数组内层维度不同。PostgreSQL 18.6 报告：\u003c/p\u003e\n\u003cpre\u003e\u003ccode\u003eSQLSTATE: 2202E\nseverity: ERROR\nmessage_primary: cannot concatenate incompatible arrays\nmessage_detail: Arrays with differing element dimensions are not compatible for concatenation.\nsource: array_userfuncs.c / array_cat / line 450\n\u003c/code\u003e\u003c/pre\u003e\n\u003cp\u003ePostgreSQL 10.21 的同一案例给出相同的主报文和详细信息文本，历史源码行号是 356。第二条语句返回 \u003ccode\u003e{1,2,3,4}\u003c/code\u003e。这些报文和详细信息属于拼接路径，不是所有 \u003ccode\u003e2202E\u003c/code\u003e 调用方都必然使用的措辞。\u003c/p\u003e\n\u003cp\u003e其他源码确认的模板包括 \u003ccode\u003earray subscript out of range\u003c/code\u003e、\u003ccode\u003earray slice subscript must provide both boundaries\u003c/code\u003e（详细信息会解释给空数组赋值的要求），以及 \u003ccode\u003eupper bound cannot be less than lower bound\u003c/code\u003e。如果驱动程序提供这些字段，请保留 \u003ccode\u003emessage_detail\u003c/code\u003e、\u003ccode\u003emessage_hint\u003c/code\u003e、\u003ccode\u003esource_file\u003c/code\u003e、\u003ccode\u003esource_function\u003c/code\u003e 和 \u003ccode\u003esource_line\u003c/code\u003e；它们往往能区分切片校验与拼接校验。\u003c/p\u003e\n\u003ch2\u003e诊断 {#diagnosis}\u003c/h2\u003e\n\u003cp\u003e先按表达式分类：\u003c/p\u003e\n\u003cul\u003e\n\u003cli\u003e普通元素读取如 \u003ccode\u003ea[999]\u003c/code\u003e 可以合法返回 \u003ccode\u003eNULL\u003c/code\u003e。在称为服务器错误前，检查数组本身、下标表达式以及存储的边界。\u003c/li\u003e\n\u003cli\u003e切片读取根据文档规则可能返回 \u003ccode\u003eNULL\u003c/code\u003e、空的零维数组或缩减后的重叠部分。没有错误响应时不要把这些值映射成 \u003ccode\u003e2202E\u003c/code\u003e。\u003c/li\u003e\n\u003cli\u003e赋值、数组构造和拼接会执行校验代码。记录数组秩、维度、下界、提供的下标数量，以及语句是否在修改值。\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp\u003e遇到真实错误时，记录 SQLSTATE、严重级别、主报文、详细信息、提示、语句位置以及关系对象或函数上下文。使用同一个值或源表达式配合 \u003ccode\u003earray_ndims\u003c/code\u003e、\u003ccode\u003earray_dims\u003c/code\u003e、\u003ccode\u003earray_lower\u003c/code\u003e 和 \u003ccode\u003earray_upper\u003c/code\u003e 对照。拼接时比较每一个非拼接维度和下界；切片时检查两个边界及其顺序；构造时检查每个子数组的形状。\u003c/p\u003e\n\u003cp\u003e在 PL/pgSQL 中，处理器可以捕获 \u003ccode\u003earray_subscript_error\u003c/code\u003e 或 \u003ccode\u003eSQLSTATE \u0026#39;2202E\u0026#39;\u003c/code\u003e，但处理器的事务行为取决于代码块。带 \u003ccode\u003eEXCEPTION\u003c/code\u003e 子句的代码块会让受保护主体在子事务中运行；主体出错后，主体内对持久数据库状态的修改会先回滚，再运行处理器。\u003ccode\u003eOTHERS\u003c/code\u003e 也有文档规定的排除项，应用要修复数组操作时应使用具体条件。\u003c/p\u003e\n\u003ch2\u003e处理 {#response}\u003c/h2\u003e\n\u003cp\u003e修复违反形状契约的操作。拼接前统一维度和下界；提供完整且顺序正确的切片边界；只有在确实需要 \u003ccode\u003eNULL\u003c/code\u003e 填充语义时才使用一维扩展；或者使用形状匹配的子数组重新构造多维值。如果读取返回 \u003ccode\u003eNULL\u003c/code\u003e 是合法结果，应先按值处理，不要在判断应用是否需要区分“缺少元素”和“存储的 NULL 元素”前就用 \u003ccode\u003eCOALESCE\u003c/code\u003e 掩盖它。\u003c/p\u003e\n\u003cp\u003e代表性错误在自动提交下运行。失败后连接状态为 \u003ccode\u003eIDLE\u003c/code\u003e，有效拼接成功。在显式事务中，\u003ccode\u003eERROR\u003c/code\u003e 通常会让事务进入中止状态，直到 \u003ccode\u003eROLLBACK\u003c/code\u003e 或回滚到保存点；连接本身不一定需要关闭。带异常子句的 PL/pgSQL 代码块可以让受保护主体在子事务中封装失败，主体内的修改会在处理器运行前回滚。应读取客户端的实际事务状态，不要仅凭 \u003ccode\u003e2202E\u003c/code\u003e 推断连接结局。\u003c/p\u003e\n\u003ch2\u003e版本 {#versions}\u003c/h2\u003e\n\u003cp\u003e目录记录 \u003ccode\u003e2202E\u003c/code\u003e 存在于锁定的 7.4–8.4.22 pre-9.0 正式源码、9.0.23 至 18.6 的全部正式快照及 19 Beta 3 预览快照。同 tag 的 \u003ccode\u003eREL8_1_4\u003c/code\u003e \u003ccode\u003eerrcodes.sgml\u003c/code\u003e 表已经列出 \u003ccode\u003e2202E\u003c/code\u003e 和条件名 \u003ccode\u003earray_subscript_error\u003c/code\u003e，因此至少可以确认 8.1.4 已有该条件名。7.0–7.3 仍有候选源码缺口，因此 7.4 观察结果只是存在边界，不是精确引入版本。18.6 固定源码 commit 为 \u003ccode\u003e724edf9bde9d356724ad384a2e196edc3c9f80f7\u003c/code\u003e；其 \u003ccode\u003eerrcodes.txt\u003c/code\u003e 同时保留别名宏和带条件名的宏。\u003c/p\u003e\n\u003cp\u003e不兼容维度案例在 PostgreSQL 18.6 和 10.21 上均通过，主报文和详细信息文本相同而源码行号不同。这个跨版本结果不保证所有旧小版本或其他 \u003ccode\u003e2202E\u003c/code\u003e 调用路径的措辞都不变。\u003c/p\u003e\n\u003ch2\u003e相关 {#related}\u003c/h2\u003e\n\u003cp\u003e\u003ca href=\"/wiki/sqlstate/22000/\" rel=\"nofollow\"\u003e\u003ccode\u003e22000\u003c/code\u003e — \u003ccode\u003edata_exception\u003c/code\u003e\u003c/a\u003e 是宽泛的类别 22 代码。\u003ca href=\"/wiki/sqlstate/22005/\" rel=\"nofollow\"\u003e\u003ccode\u003e22005\u003c/code\u003e — \u003ccode\u003eerror_in_assignment\u003c/code\u003e\u003c/a\u003e 是不同的赋值条件，不应替代数组专用的 \u003ccode\u003e2202E\u003c/code\u003e。\u003ca href=\"/wiki/sqlstate/22P02/\" rel=\"nofollow\"\u003e\u003ccode\u003e22P02\u003c/code\u003e — \u003ccode\u003einvalid_text_representation\u003c/code\u003e\u003c/a\u003e 处理输入文本解析。\u003ccode\u003e2202E\u003c/code\u003e 也不同于成功的越界读取，后者按数组文档规则返回 \u003ccode\u003eNULL\u003c/code\u003e。\u003c/p\u003e\n\u003ch2\u003e来源 {#sources}\u003c/h2\u003e\n\u003cp\u003e结构化证据记录在\u003ca href=\"#sources\" rel=\"nofollow\"\u003e公开证据 JSON\u003c/a\u003e中。源码记录固定到 PostgreSQL commit \u003ccode\u003e724edf9bde9d356724ad384a2e196edc3c9f80f7\u003c/code\u003e；运行记录保留共享注册表、两个目标版本和 \u003ccode\u003e2202E-snippet-registry-final-20260909\u003c/code\u003e 运行 ID。\u003c/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ccode\u003esrc.errcodes.18.6\u003c/code\u003e — \u003ca href=\"https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/backend/utils/errcodes.txt#L159-L164\" rel=\"nofollow\"\u003e\u003ccode\u003eerrcodes.txt\u003c/code\u003e\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003esrc.array-userfuncs.18.6\u003c/code\u003e — \u003ca href=\"https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/backend/utils/adt/array_userfuncs.c#L443-L450\" rel=\"nofollow\"\u003e\u003ccode\u003earray_userfuncs.c\u003c/code\u003e\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003esrc.arrayfuncs.18.6\u003c/code\u003e — \u003ca href=\"https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/backend/utils/adt/arrayfuncs.c#L2644-L2653\" rel=\"nofollow\"\u003e\u003ccode\u003earrayfuncs.c\u003c/code\u003e\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003esrc.exec-expr.18.6\u003c/code\u003e — \u003ca href=\"https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/backend/executor/execExprInterp.c#L3549-L3565\" rel=\"nofollow\"\u003e\u003ccode\u003eexecExprInterp.c\u003c/code\u003e\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003edoc.array.18\u003c/code\u003e 与 \u003ccode\u003edoc.func.18\u003c/code\u003e — \u003ca href=\"/docs/18/arrays.html\" rel=\"nofollow\"\u003eArrays\u003c/a\u003e 与 \u003ca href=\"/docs/18/functions-array.html\" rel=\"nofollow\"\u003eArray Functions and Operators\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003edoc.transactions.18\u003c/code\u003e — \u003ca href=\"/docs/18/tutorial-transactions.html\" rel=\"nofollow\"\u003eTransactions\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e\n","SourceRevision":"english-manuals:c2540537867663a348ed74978e2f14d64fb4dc6fbb0f1b5d2eced9085e906c15","ContentHash":"a0f75593fcdb30c181c36789a89f86c20ac717dd15c87965d93c585157001d73","Payload":{"body_md":"\n## 速览 {#at-a-glance}\n\n`2202E` 是类别 22 `Data Exception` 中的 `array_subscript_error` 条件。目录同时保留 `ERRCODE_ARRAY_ELEMENT_ERROR` 这一兼容别名，并使用 `ERRCODE_ARRAY_SUBSCRIPT_ERROR` 作为带条件名的宏。两个宏编码的是同一个 SQLSTATE。\n\n不要把所有看起来越界的表达式都当成错误。PostgreSQL 文档明确说明，读取当前边界之外的数组下标会返回 `NULL`；提供错误数量的下标同样返回 `NULL`。数组切片还有独立的历史规则：完全位于边界外的切片可以产生空的零维数组，部分重叠的切片则缩减为重叠部分。\n\n当其他路径校验形状或下标并拒绝它时才会抛出 `2202E`。核心源码中的这类路径包括数组拼接或构造时维度不兼容、无效切片边界，以及部分带下标赋值检查。诊断时，操作本身和下标数值同样重要。\n\n可执行的代表性案例是 `incompatible_array_dimensions`。它在 PostgreSQL 18.6 和 10.21 上均通过：不兼容的拼接抛出 `2202E`，随后同一自动提交连接保持 `IDLE`，并成功执行有效的后续拼接。下面的 SQL 摘录是共享注册表中的完整有序语句对；测试执行器仍是建表和清理的唯一来源。\n\n\n## 含义与触发路径 {#meaning}\n\n18.6 目录中的定义是类别 22 下的 `2202E E ERRCODE_ARRAY_SUBSCRIPT_ERROR array_subscript_error`。前面的别名行是 `2202E E ERRCODE_ARRAY_ELEMENT_ERROR`；源码注释解释 SQL99 的 “array element error” 实际上就是数组下标错误。因此，仍使用别名的代码指向同一 SQLSTATE，而不是另一种条件。\n\n数组具有秩、每个维度的长度以及下界。PostgreSQL 不要求数组从 1 开始，所以诊断时应读取实际下界，而不是作这个假设。文档中的 `array_ndims`、`array_dims`、`array_lower`、`array_upper` 和 `cardinality` 函数可以查看所需的元数据。需要诊断错误时，应在同一会话中实际调用这些检查函数；它们是检查工具，不代表已经触发了某个特定错误。\n\n核心路径主要包括：\n\n1. **数组元素或切片赋值。** `arrayfuncs.c` 会校验下标和切片边界。一维数组可以通过给新元素赋值来扩展，中间位置填入 `NULL`；多维数组不支持这种扩展。给空数组赋切片时必须提供两个边界。因此，赋值访问当前读取边界之外的位置时，应按赋值操作分析，不能从 `SELECT a[n]` 的结果推断。\n2. **数组拼接。** 当同秩数组的非拼接维度的长度或下界不同时，`array_cat` 抛出 `2202E`。代表性案例覆盖的就是这条路径。\n3. **多维构造。** 表达式执行器在用于构造多维数组的非空数组表达式维度不兼容时，也会抛出同一条件。\n\n源码中还存在其他调用方，包括数据类型辅助路径。类别 22 是宽泛的数据异常类别；具体是哪个形状或下标契约失败，要由 `2202E` 条目、源码函数和报文共同确定。\n\n## 报文与诊断 {#messages}\n\n可执行摘录如下：\n\n```sql\nSELECT ARRAY[[1,2]] || ARRAY[[3]];\nSELECT ARRAY[1,2] || ARRAY[3,4];\n```\n\n第一条语句的两个二维数组内层维度不同。PostgreSQL 18.6 报告：\n\n```text\nSQLSTATE: 2202E\nseverity: ERROR\nmessage_primary: cannot concatenate incompatible arrays\nmessage_detail: Arrays with differing element dimensions are not compatible for concatenation.\nsource: array_userfuncs.c / array_cat / line 450\n```\n\nPostgreSQL 10.21 的同一案例给出相同的主报文和详细信息文本，历史源码行号是 356。第二条语句返回 `{1,2,3,4}`。这些报文和详细信息属于拼接路径，不是所有 `2202E` 调用方都必然使用的措辞。\n\n其他源码确认的模板包括 `array subscript out of range`、`array slice subscript must provide both boundaries`（详细信息会解释给空数组赋值的要求），以及 `upper bound cannot be less than lower bound`。如果驱动程序提供这些字段，请保留 `message_detail`、`message_hint`、`source_file`、`source_function` 和 `source_line`；它们往往能区分切片校验与拼接校验。\n\n## 诊断 {#diagnosis}\n\n先按表达式分类：\n\n- 普通元素读取如 `a[999]` 可以合法返回 `NULL`。在称为服务器错误前，检查数组本身、下标表达式以及存储的边界。\n- 切片读取根据文档规则可能返回 `NULL`、空的零维数组或缩减后的重叠部分。没有错误响应时不要把这些值映射成 `2202E`。\n- 赋值、数组构造和拼接会执行校验代码。记录数组秩、维度、下界、提供的下标数量，以及语句是否在修改值。\n\n遇到真实错误时，记录 SQLSTATE、严重级别、主报文、详细信息、提示、语句位置以及关系对象或函数上下文。使用同一个值或源表达式配合 `array_ndims`、`array_dims`、`array_lower` 和 `array_upper` 对照。拼接时比较每一个非拼接维度和下界；切片时检查两个边界及其顺序；构造时检查每个子数组的形状。\n\n在 PL/pgSQL 中，处理器可以捕获 `array_subscript_error` 或 `SQLSTATE '2202E'`，但处理器的事务行为取决于代码块。带 `EXCEPTION` 子句的代码块会让受保护主体在子事务中运行；主体出错后，主体内对持久数据库状态的修改会先回滚，再运行处理器。`OTHERS` 也有文档规定的排除项，应用要修复数组操作时应使用具体条件。\n\n## 处理 {#response}\n\n修复违反形状契约的操作。拼接前统一维度和下界；提供完整且顺序正确的切片边界；只有在确实需要 `NULL` 填充语义时才使用一维扩展；或者使用形状匹配的子数组重新构造多维值。如果读取返回 `NULL` 是合法结果，应先按值处理，不要在判断应用是否需要区分“缺少元素”和“存储的 NULL 元素”前就用 `COALESCE` 掩盖它。\n\n代表性错误在自动提交下运行。失败后连接状态为 `IDLE`，有效拼接成功。在显式事务中，`ERROR` 通常会让事务进入中止状态，直到 `ROLLBACK` 或回滚到保存点；连接本身不一定需要关闭。带异常子句的 PL/pgSQL 代码块可以让受保护主体在子事务中封装失败，主体内的修改会在处理器运行前回滚。应读取客户端的实际事务状态，不要仅凭 `2202E` 推断连接结局。\n\n## 版本 {#versions}\n\n目录记录 `2202E` 存在于锁定的 7.4–8.4.22 pre-9.0 正式源码、9.0.23 至 18.6 的全部正式快照及 19 Beta 3 预览快照。同 tag 的 `REL8_1_4` `errcodes.sgml` 表已经列出 `2202E` 和条件名 `array_subscript_error`，因此至少可以确认 8.1.4 已有该条件名。7.0–7.3 仍有候选源码缺口，因此 7.4 观察结果只是存在边界，不是精确引入版本。18.6 固定源码 commit 为 `724edf9bde9d356724ad384a2e196edc3c9f80f7`；其 `errcodes.txt` 同时保留别名宏和带条件名的宏。\n\n不兼容维度案例在 PostgreSQL 18.6 和 10.21 上均通过，主报文和详细信息文本相同而源码行号不同。这个跨版本结果不保证所有旧小版本或其他 `2202E` 调用路径的措辞都不变。\n\n## 相关 {#related}\n\n[`22000` — `data_exception`](/wiki/sqlstate/22000/) 是宽泛的类别 22 代码。[`22005` — `error_in_assignment`](/wiki/sqlstate/22005/) 是不同的赋值条件，不应替代数组专用的 `2202E`。[`22P02` — `invalid_text_representation`](/wiki/sqlstate/22P02/) 处理输入文本解析。`2202E` 也不同于成功的越界读取，后者按数组文档规则返回 `NULL`。\n\n## 来源 {#sources}\n\n结构化证据记录在[公开证据 JSON](#sources)中。源码记录固定到 PostgreSQL commit `724edf9bde9d356724ad384a2e196edc3c9f80f7`；运行记录保留共享注册表、两个目标版本和 `2202E-snippet-registry-final-20260909` 运行 ID。\n\n- `src.errcodes.18.6` — [`errcodes.txt`](https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/backend/utils/errcodes.txt#L159-L164)\n- `src.array-userfuncs.18.6` — [`array_userfuncs.c`](https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/backend/utils/adt/array_userfuncs.c#L443-L450)\n- `src.arrayfuncs.18.6` — [`arrayfuncs.c`](https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/backend/utils/adt/arrayfuncs.c#L2644-L2653)\n- `src.exec-expr.18.6` — [`execExprInterp.c`](https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/backend/executor/execExprInterp.c#L3549-L3565)\n- `doc.array.18` 与 `doc.func.18` — [Arrays](/docs/18/arrays.html) 与 [Array Functions and Operators](/docs/18/functions-array.html)\n- `doc.transactions.18` — [Transactions](/docs/18/tutorial-transactions.html)\n","description":"PostgreSQL 使用 SQLSTATE 2202E 表示数组下标或形状错误。应区分越界读取返回 NULL 的情况，以及会校验数组维度的赋值、切片、构造和拼接路径。","is_stale":false,"name":"数组下标错误","sections":[{"anchor":"at-a-glance","heading":"速览","html":"\u003cp\u003e\u003ccode\u003e2202E\u003c/code\u003e 是类别 22 \u003ccode\u003eData Exception\u003c/code\u003e 中的 \u003ccode\u003earray_subscript_error\u003c/code\u003e 条件。目录同时保留 \u003ccode\u003eERRCODE_ARRAY_ELEMENT_ERROR\u003c/code\u003e 这一兼容别名，并使用 \u003ccode\u003eERRCODE_ARRAY_SUBSCRIPT_ERROR\u003c/code\u003e 作为带条件名的宏。两个宏编码的是同一个 SQLSTATE。\u003c/p\u003e\n\u003cp\u003e不要把所有看起来越界的表达式都当成错误。PostgreSQL 文档明确说明，读取当前边界之外的数组下标会返回 \u003ccode\u003eNULL\u003c/code\u003e；提供错误数量的下标同样返回 \u003ccode\u003eNULL\u003c/code\u003e。数组切片还有独立的历史规则：完全位于边界外的切片可以产生空的零维数组，部分重叠的切片则缩减为重叠部分。\u003c/p\u003e\n\u003cp\u003e当其他路径校验形状或下标并拒绝它时才会抛出 \u003ccode\u003e2202E\u003c/code\u003e。核心源码中的这类路径包括数组拼接或构造时维度不兼容、无效切片边界，以及部分带下标赋值检查。诊断时，操作本身和下标数值同样重要。\u003c/p\u003e\n\u003cp\u003e可执行的代表性案例是 \u003ccode\u003eincompatible_array_dimensions\u003c/code\u003e。它在 PostgreSQL 18.6 和 10.21 上均通过：不兼容的拼接抛出 \u003ccode\u003e2202E\u003c/code\u003e，随后同一自动提交连接保持 \u003ccode\u003eIDLE\u003c/code\u003e，并成功执行有效的后续拼接。下面的 SQL 摘录是共享注册表中的完整有序语句对；测试执行器仍是建表和清理的唯一来源。\u003c/p\u003e"},{"anchor":"meaning","heading":"含义与触发路径","html":"\u003cp\u003e18.6 目录中的定义是类别 22 下的 \u003ccode\u003e2202E E ERRCODE_ARRAY_SUBSCRIPT_ERROR array_subscript_error\u003c/code\u003e。前面的别名行是 \u003ccode\u003e2202E E ERRCODE_ARRAY_ELEMENT_ERROR\u003c/code\u003e；源码注释解释 SQL99 的 “array element error” 实际上就是数组下标错误。因此，仍使用别名的代码指向同一 SQLSTATE，而不是另一种条件。\u003c/p\u003e\n\u003cp\u003e数组具有秩、每个维度的长度以及下界。PostgreSQL 不要求数组从 1 开始，所以诊断时应读取实际下界，而不是作这个假设。文档中的 \u003ccode\u003earray_ndims\u003c/code\u003e、\u003ccode\u003earray_dims\u003c/code\u003e、\u003ccode\u003earray_lower\u003c/code\u003e、\u003ccode\u003earray_upper\u003c/code\u003e 和 \u003ccode\u003ecardinality\u003c/code\u003e 函数可以查看所需的元数据。需要诊断错误时，应在同一会话中实际调用这些检查函数；它们是检查工具，不代表已经触发了某个特定错误。\u003c/p\u003e\n\u003cp\u003e核心路径主要包括：\u003c/p\u003e\n\u003col\u003e\n\u003cli\u003e\u003cstrong\u003e数组元素或切片赋值。\u003c/strong\u003e \u003ccode\u003earrayfuncs.c\u003c/code\u003e 会校验下标和切片边界。一维数组可以通过给新元素赋值来扩展，中间位置填入 \u003ccode\u003eNULL\u003c/code\u003e；多维数组不支持这种扩展。给空数组赋切片时必须提供两个边界。因此，赋值访问当前读取边界之外的位置时，应按赋值操作分析，不能从 \u003ccode\u003eSELECT a[n]\u003c/code\u003e 的结果推断。\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003e数组拼接。\u003c/strong\u003e 当同秩数组的非拼接维度的长度或下界不同时，\u003ccode\u003earray_cat\u003c/code\u003e 抛出 \u003ccode\u003e2202E\u003c/code\u003e。代表性案例覆盖的就是这条路径。\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003e多维构造。\u003c/strong\u003e 表达式执行器在用于构造多维数组的非空数组表达式维度不兼容时，也会抛出同一条件。\u003c/li\u003e\n\u003c/ol\u003e\n\u003cp\u003e源码中还存在其他调用方，包括数据类型辅助路径。类别 22 是宽泛的数据异常类别；具体是哪个形状或下标契约失败，要由 \u003ccode\u003e2202E\u003c/code\u003e 条目、源码函数和报文共同确定。\u003c/p\u003e"},{"anchor":"messages","heading":"报文与诊断","html":"\u003cp\u003e可执行摘录如下：\u003c/p\u003e\n\u003cpre\u003e\u003ccode class=\"language-sql\"\u003eSELECT ARRAY[[1,2]] || ARRAY[[3]];\nSELECT ARRAY[1,2] || ARRAY[3,4];\n\u003c/code\u003e\u003c/pre\u003e\n\u003cp\u003e第一条语句的两个二维数组内层维度不同。PostgreSQL 18.6 报告：\u003c/p\u003e\n\u003cpre\u003e\u003ccode class=\"language-text\"\u003eSQLSTATE: 2202E\nseverity: ERROR\nmessage_primary: cannot concatenate incompatible arrays\nmessage_detail: Arrays with differing element dimensions are not compatible for concatenation.\nsource: array_userfuncs.c / array_cat / line 450\n\u003c/code\u003e\u003c/pre\u003e\n\u003cp\u003ePostgreSQL 10.21 的同一案例给出相同的主报文和详细信息文本，历史源码行号是 356。第二条语句返回 \u003ccode\u003e{1,2,3,4}\u003c/code\u003e。这些报文和详细信息属于拼接路径，不是所有 \u003ccode\u003e2202E\u003c/code\u003e 调用方都必然使用的措辞。\u003c/p\u003e\n\u003cp\u003e其他源码确认的模板包括 \u003ccode\u003earray subscript out of range\u003c/code\u003e、\u003ccode\u003earray slice subscript must provide both boundaries\u003c/code\u003e（详细信息会解释给空数组赋值的要求），以及 \u003ccode\u003eupper bound cannot be less than lower bound\u003c/code\u003e。如果驱动程序提供这些字段，请保留 \u003ccode\u003emessage_detail\u003c/code\u003e、\u003ccode\u003emessage_hint\u003c/code\u003e、\u003ccode\u003esource_file\u003c/code\u003e、\u003ccode\u003esource_function\u003c/code\u003e 和 \u003ccode\u003esource_line\u003c/code\u003e；它们往往能区分切片校验与拼接校验。\u003c/p\u003e"},{"anchor":"diagnosis","heading":"诊断","html":"\u003cp\u003e先按表达式分类：\u003c/p\u003e\n\u003cul\u003e\n\u003cli\u003e普通元素读取如 \u003ccode\u003ea[999]\u003c/code\u003e 可以合法返回 \u003ccode\u003eNULL\u003c/code\u003e。在称为服务器错误前，检查数组本身、下标表达式以及存储的边界。\u003c/li\u003e\n\u003cli\u003e切片读取根据文档规则可能返回 \u003ccode\u003eNULL\u003c/code\u003e、空的零维数组或缩减后的重叠部分。没有错误响应时不要把这些值映射成 \u003ccode\u003e2202E\u003c/code\u003e。\u003c/li\u003e\n\u003cli\u003e赋值、数组构造和拼接会执行校验代码。记录数组秩、维度、下界、提供的下标数量，以及语句是否在修改值。\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp\u003e遇到真实错误时，记录 SQLSTATE、严重级别、主报文、详细信息、提示、语句位置以及关系对象或函数上下文。使用同一个值或源表达式配合 \u003ccode\u003earray_ndims\u003c/code\u003e、\u003ccode\u003earray_dims\u003c/code\u003e、\u003ccode\u003earray_lower\u003c/code\u003e 和 \u003ccode\u003earray_upper\u003c/code\u003e 对照。拼接时比较每一个非拼接维度和下界；切片时检查两个边界及其顺序；构造时检查每个子数组的形状。\u003c/p\u003e\n\u003cp\u003e在 PL/pgSQL 中，处理器可以捕获 \u003ccode\u003earray_subscript_error\u003c/code\u003e 或 \u003ccode\u003eSQLSTATE '2202E'\u003c/code\u003e，但处理器的事务行为取决于代码块。带 \u003ccode\u003eEXCEPTION\u003c/code\u003e 子句的代码块会让受保护主体在子事务中运行；主体出错后，主体内对持久数据库状态的修改会先回滚，再运行处理器。\u003ccode\u003eOTHERS\u003c/code\u003e 也有文档规定的排除项，应用要修复数组操作时应使用具体条件。\u003c/p\u003e"},{"anchor":"response","heading":"处理","html":"\u003cp\u003e修复违反形状契约的操作。拼接前统一维度和下界；提供完整且顺序正确的切片边界；只有在确实需要 \u003ccode\u003eNULL\u003c/code\u003e 填充语义时才使用一维扩展；或者使用形状匹配的子数组重新构造多维值。如果读取返回 \u003ccode\u003eNULL\u003c/code\u003e 是合法结果，应先按值处理，不要在判断应用是否需要区分“缺少元素”和“存储的 NULL 元素”前就用 \u003ccode\u003eCOALESCE\u003c/code\u003e 掩盖它。\u003c/p\u003e\n\u003cp\u003e代表性错误在自动提交下运行。失败后连接状态为 \u003ccode\u003eIDLE\u003c/code\u003e，有效拼接成功。在显式事务中，\u003ccode\u003eERROR\u003c/code\u003e 通常会让事务进入中止状态，直到 \u003ccode\u003eROLLBACK\u003c/code\u003e 或回滚到保存点；连接本身不一定需要关闭。带异常子句的 PL/pgSQL 代码块可以让受保护主体在子事务中封装失败，主体内的修改会在处理器运行前回滚。应读取客户端的实际事务状态，不要仅凭 \u003ccode\u003e2202E\u003c/code\u003e 推断连接结局。\u003c/p\u003e"},{"anchor":"versions","heading":"版本","html":"\u003cp\u003e目录记录 \u003ccode\u003e2202E\u003c/code\u003e 存在于锁定的 7.4–8.4.22 pre-9.0 正式源码、9.0.23 至 18.6 的全部正式快照及 19 Beta 3 预览快照。同 tag 的 \u003ccode\u003eREL8_1_4\u003c/code\u003e \u003ccode\u003eerrcodes.sgml\u003c/code\u003e 表已经列出 \u003ccode\u003e2202E\u003c/code\u003e 和条件名 \u003ccode\u003earray_subscript_error\u003c/code\u003e，因此至少可以确认 8.1.4 已有该条件名。7.0–7.3 仍有候选源码缺口，因此 7.4 观察结果只是存在边界，不是精确引入版本。18.6 固定源码 commit 为 \u003ccode\u003e724edf9bde9d356724ad384a2e196edc3c9f80f7\u003c/code\u003e；其 \u003ccode\u003eerrcodes.txt\u003c/code\u003e 同时保留别名宏和带条件名的宏。\u003c/p\u003e\n\u003cp\u003e不兼容维度案例在 PostgreSQL 18.6 和 10.21 上均通过，主报文和详细信息文本相同而源码行号不同。这个跨版本结果不保证所有旧小版本或其他 \u003ccode\u003e2202E\u003c/code\u003e 调用路径的措辞都不变。\u003c/p\u003e"},{"anchor":"related","heading":"相关","html":"\u003cp\u003e\u003ca href=\"/wiki/sqlstate/22000/\"\u003e\u003ccode\u003e22000\u003c/code\u003e — \u003ccode\u003edata_exception\u003c/code\u003e\u003c/a\u003e 是宽泛的类别 22 代码。\u003ca href=\"/wiki/sqlstate/22005/\"\u003e\u003ccode\u003e22005\u003c/code\u003e — \u003ccode\u003eerror_in_assignment\u003c/code\u003e\u003c/a\u003e 是不同的赋值条件，不应替代数组专用的 \u003ccode\u003e2202E\u003c/code\u003e。\u003ca href=\"/wiki/sqlstate/22P02/\"\u003e\u003ccode\u003e22P02\u003c/code\u003e — \u003ccode\u003einvalid_text_representation\u003c/code\u003e\u003c/a\u003e 处理输入文本解析。\u003ccode\u003e2202E\u003c/code\u003e 也不同于成功的越界读取，后者按数组文档规则返回 \u003ccode\u003eNULL\u003c/code\u003e。\u003c/p\u003e"},{"anchor":"sources","heading":"来源","html":"\u003cp\u003e结构化证据记录在\u003ca href=\"#sources\"\u003e公开证据 JSON\u003c/a\u003e中。源码记录固定到 PostgreSQL commit \u003ccode\u003e724edf9bde9d356724ad384a2e196edc3c9f80f7\u003c/code\u003e；运行记录保留共享注册表、两个目标版本和 \u003ccode\u003e2202E-snippet-registry-final-20260909\u003c/code\u003e 运行 ID。\u003c/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ccode\u003esrc.errcodes.18.6\u003c/code\u003e — \u003ca href=\"https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/backend/utils/errcodes.txt#L159-L164\"\u003e\u003ccode\u003eerrcodes.txt\u003c/code\u003e\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003esrc.array-userfuncs.18.6\u003c/code\u003e — \u003ca href=\"https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/backend/utils/adt/array_userfuncs.c#L443-L450\"\u003e\u003ccode\u003earray_userfuncs.c\u003c/code\u003e\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003esrc.arrayfuncs.18.6\u003c/code\u003e — \u003ca href=\"https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/backend/utils/adt/arrayfuncs.c#L2644-L2653\"\u003e\u003ccode\u003earrayfuncs.c\u003c/code\u003e\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003esrc.exec-expr.18.6\u003c/code\u003e — \u003ca href=\"https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/backend/executor/execExprInterp.c#L3549-L3565\"\u003e\u003ccode\u003eexecExprInterp.c\u003c/code\u003e\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003edoc.array.18\u003c/code\u003e 与 \u003ccode\u003edoc.func.18\u003c/code\u003e — \u003ca href=\"/docs/18/arrays.html\"\u003eArrays\u003c/a\u003e 与 \u003ca href=\"/docs/18/functions-array.html\"\u003eArray Functions and Operators\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003edoc.transactions.18\u003c/code\u003e — \u003ca href=\"/docs/18/tutorial-transactions.html\"\u003eTransactions\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e"}],"summary":"数组下标或维度错误，如拼接维度不兼容。","title":"2202E — array_subscript_error（数组下标错误）","translation_source_rev":"791e71de5b934add1a94a62edd587c3a3b4cb06acafd2c7cefceee28a5f02d74"}},"RequestedLocale":"zh-Hans","Fallback":false,"Versions":["10","11","12","13","14","15","16","17","18","19","20","8.1","8.2","8.3","8.4","9.0","9.1","9.2","9.3","9.4","9.5","9.6"],"Locales":["en","zh-Hans"],"Signatures":null,"Spellings":null,"SQLState":{"aliases":["ERRCODE_ARRAY_ELEMENT_ERROR"],"catalogue_notes":{"earliest_observed":"7.4","formal_scope":"9.0.0..18.6","latest_observed":"18.6","matrix_scope":["9.0.23","9.1.24","9.2.24","9.3.25","9.4.26","9.5.25","9.6.24","10.23","11.22","12.22","13.23","14.24","15.19","16.15","17.11","18.6"],"pre9_scope":{"formal_tag_count":191,"maximum_release":"8.4.22","minimum_release":"7.0.0","source_definition_count":153,"source_doc_count":153,"source_file_count":306,"source_scope":"7.4..8.4 definition files; 7.0..7.3 candidate-path source gap probes","source_tag_count":153},"pre9_status":"present","preview_scope":["19beta3"]},"class":"22","class_name":"Data Exception","condition_name":"array_subscript_error","condition_names":["array_subscript_error"],"definition_changes":[],"english_manuals":{"10":{"aliases":[],"class_name":"Data Exception","condition_name":"array_subscript_error","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"9607b57e9f639b61785677ba4d226f5889fe1d19c8bf55a3337691899a9073cd","slug":"10"},"lang":"en","sqlstate":"2202E"},"11":{"aliases":[],"class_name":"Data Exception","condition_name":"array_subscript_error","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"3a024e38263ad77de228eed7930b842b42dc1d5cab9ca3727be8eed872ec9539","slug":"11"},"lang":"en","sqlstate":"2202E"},"12":{"aliases":[],"class_name":"Data 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