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913bbd88dc
Use the parser's standard type coercion machinery to convert the output column(s) of a SQL function's final SELECT or RETURNING to the type(s) they should have according to the function's declared result type. We'll allow any case where an assignment-level coercion is available. Previously, we failed unless the required coercion was a binary-compatible one (and the documentation ignored this, falsely claiming that the types must match exactly). Notably, the coercion now accounts for typmods, so that cases where a SQL function is declared to return a composite type whose columns are typmod-constrained now behave as one would expect. Arguably this aspect is a bug fix, but the overall behavioral change here seems too large to consider back-patching. A nice side-effect is that functions can now be inlined in a few cases where we previously failed to do so because of type mismatches. Discussion: https://postgr.es/m/18929.1574895430@sss.pgh.pa.us
42 lines
1.2 KiB
C
42 lines
1.2 KiB
C
/*-------------------------------------------------------------------------
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*
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* functions.h
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* Declarations for execution of SQL-language functions.
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*
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*
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* Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/include/executor/functions.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef FUNCTIONS_H
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#define FUNCTIONS_H
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#include "nodes/execnodes.h"
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#include "tcop/dest.h"
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/* This struct is known only within executor/functions.c */
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typedef struct SQLFunctionParseInfo *SQLFunctionParseInfoPtr;
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extern Datum fmgr_sql(PG_FUNCTION_ARGS);
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extern SQLFunctionParseInfoPtr prepare_sql_fn_parse_info(HeapTuple procedureTuple,
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Node *call_expr,
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Oid inputCollation);
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extern void sql_fn_parser_setup(struct ParseState *pstate,
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SQLFunctionParseInfoPtr pinfo);
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extern void check_sql_fn_statements(List *queryTreeList);
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extern bool check_sql_fn_retval(List *queryTreeList,
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Oid rettype, TupleDesc rettupdesc,
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bool insertDroppedCols,
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List **resultTargetList);
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extern DestReceiver *CreateSQLFunctionDestReceiver(void);
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#endif /* FUNCTIONS_H */
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