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/*-------------------------------------------------------------------------
*
* functions.h
* Declarations for execution of SQL-language functions.
*
*
* Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/executor/functions.h
*
*-------------------------------------------------------------------------
*/
#ifndef FUNCTIONS_H
#define FUNCTIONS_H
#include "nodes/execnodes.h"
#include "tcop/dest.h"
/*
* Data structure needed by the parser callback hooks to resolve parameter
* references during parsing of a SQL function's body. This is separate from
* SQLFunctionCache since we sometimes do parsing separately from execution.
*/
typedef struct SQLFunctionParseInfo
{
char *fname; /* function's name */
int nargs; /* number of input arguments */
Oid *argtypes; /* resolved types of input arguments */
char **argnames; /* names of input arguments; NULL if none */
/* Note that argnames[i] can be NULL, if some args are unnamed */
Oid collation; /* function's input collation, if known */
} SQLFunctionParseInfo;
typedef SQLFunctionParseInfo *SQLFunctionParseInfoPtr;
extern Datum fmgr_sql(PG_FUNCTION_ARGS);
extern SQLFunctionParseInfoPtr prepare_sql_fn_parse_info(HeapTuple procedureTuple,
Node *call_expr,
Oid inputCollation);
extern void sql_fn_parser_setup(struct ParseState *pstate,
SQLFunctionParseInfoPtr pinfo);
extern void check_sql_fn_statements(List *queryTreeLists);
extern bool check_sql_fn_retval(List *queryTreeLists,
Oid rettype, TupleDesc rettupdesc,
bool insertDroppedCols,
List **resultTargetList);
extern DestReceiver *CreateSQLFunctionDestReceiver(void);
#endif /* FUNCTIONS_H */
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