parse_func.h

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/*-------------------------------------------------------------------------
 *
 * parse_func.h
 *
 *
 *
 * Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/parser/parse_func.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef PARSER_FUNC_H
#define PARSER_FUNC_H

#include "catalog/namespace.h"
#include "parser/parse_node.h"


/* Result codes for func_get_detail */
typedef enum
{
    FUNCDETAIL_NOTFOUND,        /* no matching function */
    FUNCDETAIL_MULTIPLE,        /* too many matching functions */
    FUNCDETAIL_NORMAL,          /* found a matching regular function */
    FUNCDETAIL_AGGREGATE,       /* found a matching aggregate function */
    FUNCDETAIL_WINDOWFUNC,      /* found a matching window function */
    FUNCDETAIL_COERCION         /* it's a type coercion request */
} FuncDetailCode;


extern Node *ParseFuncOrColumn(ParseState *pstate, List *funcname, List *fargs,
                  FuncCall *fn, int location);

extern FuncDetailCode func_get_detail(List *funcname,
                List *fargs, List *fargnames,
                int nargs, Oid *argtypes,
                bool expand_variadic, bool expand_defaults,
                Oid *funcid, Oid *rettype,
                bool *retset, int *nvargs, Oid *vatype,
                Oid **true_typeids, List **argdefaults);

extern int func_match_argtypes(int nargs,
                    Oid *input_typeids,
                    FuncCandidateList raw_candidates,
                    FuncCandidateList *candidates);

extern FuncCandidateList func_select_candidate(int nargs,
                      Oid *input_typeids,
                      FuncCandidateList candidates);

extern void make_fn_arguments(ParseState *pstate,
                  List *fargs,
                  Oid *actual_arg_types,
                  Oid *declared_arg_types);

extern const char *funcname_signature_string(const char *funcname, int nargs,
                          List *argnames, const Oid *argtypes);
extern const char *func_signature_string(List *funcname, int nargs,
                      List *argnames, const Oid *argtypes);

extern Oid LookupFuncName(List *funcname, int nargs, const Oid *argtypes,
               bool noError);
extern Oid LookupFuncNameTypeNames(List *funcname, List *argtypes,
                        bool noError);
extern Oid LookupAggNameTypeNames(List *aggname, List *argtypes,
                       bool noError);

#endif   /* PARSE_FUNC_H */