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name","value":"pg_catalog.anyarray"},{"label":"Declared length","value":"Variable length (varlena)"},{"label":"Documented declaration","value":"anyarray"},{"label":"Input function","value":"anyarray_in"},{"label":"Output function","value":"anyarray_out"},{"label":"Storage strategy","value":"extended"},{"label":"Type OID","value":"2277"},{"label":"Type 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inventory; exact declared input types for operator classes","description":["Indicates that a function accepts any array data type (see Section 36.2.5 )."],"facts":[{"label":"Catalog name","value":"pg_catalog.anyarray"},{"label":"Type OID","value":"2277"},{"label":"Type kind","value":"Pseudo-type"},{"label":"Declared length","value":"Variable length (varlena)"},{"label":"Storage strategy","value":"extended"},{"label":"Input function","value":"anyarray_in"},{"label":"Output function","value":"anyarray_out"},{"label":"Documented declaration","value":"anyarray"},{"label":"Manual description","value":"Indicates that a function accepts any array data type (see Section 36.2.5 )."}],"manual_documentation":"dedicated family chapter","manual_html":"\u003cdiv class=\"sect1\" id=\"DATATYPE-PSEUDO\"\u003e\n\u003cdiv class=\"titlepage\"\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003ch2 class=\"title\"\u003e8.21. Pseudo-Types \u003c/h2\u003e\n\u003c/div\u003e\n\u003c/div\u003e\n\u003c/div\u003e\n\u003cp\u003eThe \u003cspan class=\"productname\"\u003ePostgreSQL\u003c/span\u003e type system contains a number of special-purpose entries that are collectively called \u003cem class=\"firstterm\"\u003epseudo-types\u003c/em\u003e. A pseudo-type cannot be used as a column data type, but it can be used to declare a function's argument or result type. Each of the available pseudo-types is useful in situations where a function's behavior does not correspond to simply taking or returning a value of a specific SQL data type. \u003ca class=\"xref\" href=\"/docs/18/datatype-pseudo.html#DATATYPE-PSEUDOTYPES-TABLE\" title=\"Table 8.27. Pseudo-Types\"\u003eTable 8.27\u003c/a\u003e lists the existing pseudo-types.\u003c/p\u003e\n\u003cdiv class=\"table\" id=\"DATATYPE-PSEUDOTYPES-TABLE\"\u003e\n\u003cp class=\"title\"\u003e\u003cstrong\u003eTable 8.27. Pseudo-Types\u003c/strong\u003e\u003c/p\u003e\n\u003cdiv class=\"table-contents\"\u003e\n\u003ctable class=\"table\"\u003e\n\n\n\n\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eName\u003c/th\u003e\n\u003cth\u003eDescription\u003c/th\u003e\n\u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eany\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any input data type.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eanyelement\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any data type (see \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eanyarray\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any array data type (see \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eanynonarray\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any non-array data type (see \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eanyenum\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any enum data type (see \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e and \u003ca class=\"xref\" href=\"/docs/18/datatype-enum.html\" title=\"8.7. Enumerated Types\"\u003eSection 8.7\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eanyrange\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any range data type (see \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e and \u003ca class=\"xref\" href=\"/docs/18/rangetypes.html\" title=\"8.17. Range Types\"\u003eSection 8.17\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eanymultirange\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any multirange data type (see \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e and \u003ca class=\"xref\" href=\"/docs/18/rangetypes.html\" title=\"8.17. Range Types\"\u003eSection 8.17\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eanycompatible\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any data type, with automatic promotion of multiple arguments to a common data type (see \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eanycompatiblearray\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any array data type, with automatic promotion of multiple arguments to a common data type (see \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eanycompatiblenonarray\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any non-array data type, with automatic promotion of multiple arguments to a common data type (see \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eanycompatiblerange\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any range data type, with automatic promotion of multiple arguments to a common data type (see \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e and \u003ca class=\"xref\" href=\"/docs/18/rangetypes.html\" title=\"8.17. Range Types\"\u003eSection 8.17\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eanycompatiblemultirange\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any multirange data type, with automatic promotion of multiple arguments to a common data type (see \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e and \u003ca class=\"xref\" href=\"/docs/18/rangetypes.html\" title=\"8.17. Range Types\"\u003eSection 8.17\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003ecstring\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts or returns a null-terminated C string.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003einternal\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts or returns a server-internal data type.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003elanguage_handler\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eA procedural language call handler is declared to return \u003ccode class=\"type\"\u003elanguage_handler\u003c/code\u003e.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003efdw_handler\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eA foreign-data wrapper handler is declared to return \u003ccode class=\"type\"\u003efdw_handler\u003c/code\u003e.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003etable_am_handler\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eA table access method handler is declared to return \u003ccode class=\"type\"\u003etable_am_handler\u003c/code\u003e.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eindex_am_handler\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eAn index access method handler is declared to return \u003ccode class=\"type\"\u003eindex_am_handler\u003c/code\u003e.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003etsm_handler\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eA tablesample method handler is declared to return \u003ccode class=\"type\"\u003etsm_handler\u003c/code\u003e.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003erecord\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIdentifies a function taking or returning an unspecified row type.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003etrigger\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eA trigger function is declared to return \u003ccode class=\"type\"\u003etrigger.\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eevent_trigger\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eAn event trigger function is declared to return \u003ccode class=\"type\"\u003eevent_trigger.\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003epg_ddl_command\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIdentifies a representation of DDL commands that is available to event triggers.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003evoid\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function returns no value.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eunknown\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIdentifies a not-yet-resolved type, e.g., of an undecorated string literal.\u003c/td\u003e\n\u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n\u003c/div\u003e\n\u003c/div\u003e\u003cbr class=\"table-break\"\u003e\n\u003cp\u003eFunctions coded in C (whether built-in or dynamically loaded) can be declared to accept or return any of these pseudo-types. It is up to the function author to ensure that the function will behave safely when a pseudo-type is used as an argument type.\u003c/p\u003e\n\u003cp\u003eFunctions coded in procedural languages can use pseudo-types only as allowed by their implementation languages. At present most procedural languages forbid use of a pseudo-type as an argument type, and allow only \u003ccode class=\"type\"\u003evoid\u003c/code\u003e and \u003ccode class=\"type\"\u003erecord\u003c/code\u003e as a result type (plus \u003ccode class=\"type\"\u003etrigger\u003c/code\u003e or \u003ccode class=\"type\"\u003eevent_trigger\u003c/code\u003e when the function is used as a trigger or event trigger). Some also support polymorphic functions using the polymorphic pseudo-types, which are shown above and discussed in detail in \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e.\u003c/p\u003e\n\u003cp\u003eThe \u003ccode class=\"type\"\u003einternal\u003c/code\u003e pseudo-type is used to declare functions that are meant only to be called internally by the database system, and not by direct invocation in an SQL query. If a function has at least one \u003ccode class=\"type\"\u003einternal\u003c/code\u003e-type argument then it cannot be called from SQL. To preserve the type safety of this restriction it is important to follow this coding rule: do not create any function that is declared to return \u003ccode class=\"type\"\u003einternal\u003c/code\u003e unless it has at least one \u003ccode class=\"type\"\u003einternal\u003c/code\u003e argument.\u003c/p\u003e\n\u003c/div\u003e","manual_path":"datatype-pseudo.html","operator_classes":[{"opcdefault":"t","opcfamily":"btree/array_ops","opcintype":"anyarray","opckeytype":"0","opcmethod":"btree","opcname":"array_ops","opcnamespace":"pg_catalog","opcowner":"POSTGRES"},{"opcdefault":"t","opcfamily":"hash/array_ops","opcintype":"anyarray","opckeytype":"0","opcmethod":"hash","opcname":"array_ops","opcnamespace":"pg_catalog","opcowner":"POSTGRES"},{"opcdefault":"t","opcfamily":"gin/array_ops","opcintype":"anyarray","opckeytype":"anyelement","opcmethod":"gin","opcname":"array_ops","opcnamespace":"pg_catalog","opcowner":"POSTGRES"}],"operators":[{"descr":"equal","oid":"1070","oid_symbol":"ARRAY_EQ_OP","oprcanhash":"t","oprcanmerge":"t","oprcode":"array_eq","oprcom":"=(anyarray,anyarray)","oprjoin":"eqjoinsel","oprkind":"b","oprleft":"anyarray","oprname":"=","oprnamespace":"pg_catalog","oprnegate":"\u003c\u003e(anyarray,anyarray)","oprowner":"POSTGRES","oprrest":"eqsel","oprresult":"bool","oprright":"anyarray"},{"descr":"not 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A pseudo-type cannot be used as a column data type, but it can be used to declare a function\u0026#39;s argument or result type. Each of the available pseudo-types is useful in situations where a function\u0026#39;s behavior does not correspond to simply taking or returning a value of a specific SQL data type. \u003ca href=\"/docs/18/datatype-pseudo.html#DATATYPE-PSEUDOTYPES-TABLE\" rel=\"nofollow\"\u003eTable 8.27\u003c/a\u003e lists the existing pseudo-types.\u003c/p\u003e\n\u003cdiv id=\"DATATYPE-PSEUDOTYPES-TABLE\"\u003e\n\u003cp\u003e\u003cstrong\u003eTable 8.27. Pseudo-Types\u003c/strong\u003e\u003c/p\u003e\n\u003cdiv\u003e\n\u003ctable\u003e\n\n\n\n\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eName\u003c/th\u003e\n\u003cth\u003eDescription\u003c/th\u003e\n\u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003eany\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any input data type.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003eanyelement\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any data type (see \u003ca href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" rel=\"nofollow\"\u003eSection 36.2.5\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003eanyarray\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any array data type (see \u003ca href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" rel=\"nofollow\"\u003eSection 36.2.5\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003eanynonarray\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any non-array data type (see \u003ca href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" rel=\"nofollow\"\u003eSection 36.2.5\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003eanyenum\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any enum data type (see \u003ca href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" rel=\"nofollow\"\u003eSection 36.2.5\u003c/a\u003e and \u003ca href=\"/docs/18/datatype-enum.html\" rel=\"nofollow\"\u003eSection 8.7\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003eanyrange\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any range data type (see \u003ca href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" rel=\"nofollow\"\u003eSection 36.2.5\u003c/a\u003e and \u003ca href=\"/docs/18/rangetypes.html\" rel=\"nofollow\"\u003eSection 8.17\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003eanymultirange\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any multirange data type (see \u003ca href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" rel=\"nofollow\"\u003eSection 36.2.5\u003c/a\u003e and \u003ca href=\"/docs/18/rangetypes.html\" rel=\"nofollow\"\u003eSection 8.17\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003eanycompatible\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any data type, with automatic promotion of multiple arguments to a common data type (see \u003ca href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" rel=\"nofollow\"\u003eSection 36.2.5\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003eanycompatiblearray\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any array data type, with automatic promotion of multiple arguments to a common data type (see \u003ca href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" rel=\"nofollow\"\u003eSection 36.2.5\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003eanycompatiblenonarray\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any non-array data type, with automatic promotion of multiple arguments to a common data type (see \u003ca href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" rel=\"nofollow\"\u003eSection 36.2.5\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003eanycompatiblerange\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any range data type, with automatic promotion of multiple arguments to a common data type (see \u003ca href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" rel=\"nofollow\"\u003eSection 36.2.5\u003c/a\u003e and \u003ca href=\"/docs/18/rangetypes.html\" rel=\"nofollow\"\u003eSection 8.17\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003eanycompatiblemultirange\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any multirange data type, with automatic promotion of multiple arguments to a common data type (see \u003ca href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" rel=\"nofollow\"\u003eSection 36.2.5\u003c/a\u003e and \u003ca href=\"/docs/18/rangetypes.html\" rel=\"nofollow\"\u003eSection 8.17\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003ecstring\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts or returns a null-terminated C string.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003einternal\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts or returns a server-internal data type.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003elanguage_handler\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eA procedural language call handler is declared to return \u003ccode\u003elanguage_handler\u003c/code\u003e.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003efdw_handler\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eA foreign-data wrapper handler is declared to return \u003ccode\u003efdw_handler\u003c/code\u003e.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003etable_am_handler\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eA table access method handler is declared to return \u003ccode\u003etable_am_handler\u003c/code\u003e.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003eindex_am_handler\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eAn index access method handler is declared to return \u003ccode\u003eindex_am_handler\u003c/code\u003e.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003etsm_handler\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eA tablesample method handler is declared to return \u003ccode\u003etsm_handler\u003c/code\u003e.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003erecord\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIdentifies a function taking or returning an unspecified row type.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003etrigger\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eA trigger function is declared to return \u003ccode\u003etrigger.\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003eevent_trigger\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eAn event trigger function is declared to return \u003ccode\u003eevent_trigger.\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003epg_ddl_command\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIdentifies a representation of DDL commands that is available to event triggers.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003evoid\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function returns no value.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003eunknown\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIdentifies a not-yet-resolved type, e.g., of an undecorated string literal.\u003c/td\u003e\n\u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n\u003c/div\u003e\n\u003c/div\u003e\u003cbr\u003e\n\u003cp\u003eFunctions coded in C (whether built-in or dynamically loaded) can be declared to accept or return any of these pseudo-types. It is up to the function author to ensure that the function will behave safely when a pseudo-type is used as an argument type.\u003c/p\u003e\n\u003cp\u003eFunctions coded in procedural languages can use pseudo-types only as allowed by their implementation languages. At present most procedural languages forbid use of a pseudo-type as an argument type, and allow only \u003ccode\u003evoid\u003c/code\u003e and \u003ccode\u003erecord\u003c/code\u003e as a result type (plus \u003ccode\u003etrigger\u003c/code\u003e or \u003ccode\u003eevent_trigger\u003c/code\u003e when the function is used as a trigger or event trigger). Some also support polymorphic functions using the polymorphic pseudo-types, which are shown above and discussed in detail in \u003ca href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" rel=\"nofollow\"\u003eSection 36.2.5\u003c/a\u003e.\u003c/p\u003e\n\u003cp\u003eThe \u003ccode\u003einternal\u003c/code\u003e pseudo-type is used to declare functions that are meant only to be called internally by the database system, and not by direct invocation in an SQL query. If a function has at least one \u003ccode\u003einternal\u003c/code\u003e-type argument then it cannot be called from SQL. To preserve the type safety of this restriction it is important to follow this coding rule: do not create any function that is declared to return \u003ccode\u003einternal\u003c/code\u003e unless it has at least one \u003ccode\u003einternal\u003c/code\u003e argument.\u003c/p\u003e\n\u003c/div\u003e","SourceRevision":"555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f","ContentHash":"fbe110d3a1d2956ae2b0bd50b8a5fe7d189fa5960aa835300b5b3115de17168a","Payload":{"description":["Indicates that a function accepts any array data type (see Section 36.2.5 )."],"manual_html":"\u003cdiv class=\"sect1\" id=\"DATATYPE-PSEUDO\"\u003e\n\u003cdiv class=\"titlepage\"\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003ch2 class=\"title\"\u003e8.21. Pseudo-Types \u003c/h2\u003e\n\u003c/div\u003e\n\u003c/div\u003e\n\u003c/div\u003e\n\u003cp\u003eThe \u003cspan class=\"productname\"\u003ePostgreSQL\u003c/span\u003e type system contains a number of special-purpose entries that are collectively called \u003cem class=\"firstterm\"\u003epseudo-types\u003c/em\u003e. A pseudo-type cannot be used as a column data type, but it can be used to declare a function's argument or result type. Each of the available pseudo-types is useful in situations where a function's behavior does not correspond to simply taking or returning a value of a specific SQL data type. \u003ca class=\"xref\" href=\"/docs/18/datatype-pseudo.html#DATATYPE-PSEUDOTYPES-TABLE\" title=\"Table 8.27. Pseudo-Types\"\u003eTable 8.27\u003c/a\u003e lists the existing pseudo-types.\u003c/p\u003e\n\u003cdiv class=\"table\" id=\"DATATYPE-PSEUDOTYPES-TABLE\"\u003e\n\u003cp class=\"title\"\u003e\u003cstrong\u003eTable 8.27. Pseudo-Types\u003c/strong\u003e\u003c/p\u003e\n\u003cdiv class=\"table-contents\"\u003e\n\u003ctable class=\"table\"\u003e\n\n\n\n\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eName\u003c/th\u003e\n\u003cth\u003eDescription\u003c/th\u003e\n\u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eany\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any input data type.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eanyelement\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any data type (see \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eanyarray\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any array data type (see \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eanynonarray\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any non-array data type (see \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eanyenum\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any enum data type (see \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e and \u003ca class=\"xref\" href=\"/docs/18/datatype-enum.html\" title=\"8.7. Enumerated Types\"\u003eSection 8.7\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eanyrange\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any range data type (see \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e and \u003ca class=\"xref\" href=\"/docs/18/rangetypes.html\" title=\"8.17. Range Types\"\u003eSection 8.17\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eanymultirange\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any multirange data type (see \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e and \u003ca class=\"xref\" href=\"/docs/18/rangetypes.html\" title=\"8.17. Range Types\"\u003eSection 8.17\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eanycompatible\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any data type, with automatic promotion of multiple arguments to a common data type (see \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eanycompatiblearray\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any array data type, with automatic promotion of multiple arguments to a common data type (see \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eanycompatiblenonarray\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any non-array data type, with automatic promotion of multiple arguments to a common data type (see \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eanycompatiblerange\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any range data type, with automatic promotion of multiple arguments to a common data type (see \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e and \u003ca class=\"xref\" href=\"/docs/18/rangetypes.html\" title=\"8.17. Range Types\"\u003eSection 8.17\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eanycompatiblemultirange\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts any multirange data type, with automatic promotion of multiple arguments to a common data type (see \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e and \u003ca class=\"xref\" href=\"/docs/18/rangetypes.html\" title=\"8.17. Range Types\"\u003eSection 8.17\u003c/a\u003e).\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003ecstring\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts or returns a null-terminated C string.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003einternal\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function accepts or returns a server-internal data type.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003elanguage_handler\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eA procedural language call handler is declared to return \u003ccode class=\"type\"\u003elanguage_handler\u003c/code\u003e.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003efdw_handler\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eA foreign-data wrapper handler is declared to return \u003ccode class=\"type\"\u003efdw_handler\u003c/code\u003e.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003etable_am_handler\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eA table access method handler is declared to return \u003ccode class=\"type\"\u003etable_am_handler\u003c/code\u003e.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eindex_am_handler\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eAn index access method handler is declared to return \u003ccode class=\"type\"\u003eindex_am_handler\u003c/code\u003e.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003etsm_handler\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eA tablesample method handler is declared to return \u003ccode class=\"type\"\u003etsm_handler\u003c/code\u003e.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003erecord\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIdentifies a function taking or returning an unspecified row type.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003etrigger\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eA trigger function is declared to return \u003ccode class=\"type\"\u003etrigger.\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eevent_trigger\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eAn event trigger function is declared to return \u003ccode class=\"type\"\u003eevent_trigger.\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003epg_ddl_command\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIdentifies a representation of DDL commands that is available to event triggers.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003evoid\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIndicates that a function returns no value.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode class=\"type\"\u003eunknown\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eIdentifies a not-yet-resolved type, e.g., of an undecorated string literal.\u003c/td\u003e\n\u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n\u003c/div\u003e\n\u003c/div\u003e\u003cbr class=\"table-break\"\u003e\n\u003cp\u003eFunctions coded in C (whether built-in or dynamically loaded) can be declared to accept or return any of these pseudo-types. It is up to the function author to ensure that the function will behave safely when a pseudo-type is used as an argument type.\u003c/p\u003e\n\u003cp\u003eFunctions coded in procedural languages can use pseudo-types only as allowed by their implementation languages. At present most procedural languages forbid use of a pseudo-type as an argument type, and allow only \u003ccode class=\"type\"\u003evoid\u003c/code\u003e and \u003ccode class=\"type\"\u003erecord\u003c/code\u003e as a result type (plus \u003ccode class=\"type\"\u003etrigger\u003c/code\u003e or \u003ccode class=\"type\"\u003eevent_trigger\u003c/code\u003e when the function is used as a trigger or event trigger). Some also support polymorphic functions using the polymorphic pseudo-types, which are shown above and discussed in detail in \u003ca class=\"xref\" href=\"/docs/18/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC\" title=\"36.2.5. Polymorphic Types\"\u003eSection 36.2.5\u003c/a\u003e.\u003c/p\u003e\n\u003cp\u003eThe \u003ccode class=\"type\"\u003einternal\u003c/code\u003e pseudo-type is used to declare functions that are meant only to be called internally by the database system, and not by direct invocation in an SQL query. If a function has at least one \u003ccode class=\"type\"\u003einternal\u003c/code\u003e-type argument then it cannot be called from SQL. To preserve the type safety of this restriction it is important to follow this coding rule: do not create any function that is declared to return \u003ccode class=\"type\"\u003einternal\u003c/code\u003e unless it has at least one \u003ccode class=\"type\"\u003einternal\u003c/code\u003e argument.\u003c/p\u003e\n\u003c/div\u003e","related":[{"label":"pg_type catalog","url":"/wiki/catalog/pg_type/?v=18"},{"label":"pg_cast catalog","url":"/wiki/catalog/pg_cast/?v=18"},{"label":"pg_operator catalog","url":"/wiki/catalog/pg_operator/?v=18"},{"label":"pg_opclass catalog","url":"/wiki/catalog/pg_opclass/?v=18"},{"label":"Arrays","url":"/wiki/type/arrays/?v=18"},{"label":"btree index access method","url":"/wiki/indexam/btree/?v=18"},{"label":"gin index access method","url":"/wiki/indexam/gin/?v=18"},{"label":"hash index access method","url":"/wiki/indexam/hash/?v=18"}],"sections":[]}},"RequestedLocale":"zh-Hans","Fallback":true,"Versions":["10","11","12","13","14","15","16","17","18","19","20"],"Locales":["en"],"Signatures":null,"Spellings":null,"SQLState":null,"Evidence":null}