functions.h

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/*-------------------------------------------------------------------------
 *
 * functions.h
 *      Declarations for execution of SQL-language functions.
 *
 *
 * Portions Copyright (c) 1996-2025, 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,
                                char prokind,
                                bool insertDroppedCols,
                                List **resultTargetList);
 
extern DestReceiver *CreateSQLFunctionDestReceiver(void);
 
#endif                          /* FUNCTIONS_H */