src/include/parser/parse_func.h

   1 /*-------------------------------------------------------------------------
   2  *
   3  * parse_func.h
   4  *
   5  *
   6  *
   7  * Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
   8  * Portions Copyright (c) 1994, Regents of the University of California
   9  *
  10  * $PostgreSQL$
  11  *
  12  *-------------------------------------------------------------------------
  13  */
  14 #ifndef PARSER_FUNC_H
  15 #define PARSER_FUNC_H
  16
  17 #include "catalog/namespace.h"
  18 #include "parser/parse_node.h"
  19
  20
  21 /*
  22  *      This structure is used to explore the inheritance hierarchy above
  23  *      nodes in the type tree in order to disambiguate among polymorphic
  24  *      functions.
  25  */
  26 typedef struct _InhPaths
  27 {
  28         int                     nsupers;                /* number of superclasses */
  29         Oid                     self;                   /* this class */
  30         Oid                *supervec;           /* vector of superclasses */
  31 } InhPaths;
  32
  33 /* Result codes for func_get_detail */
  34 typedef enum
  35 {
  36         FUNCDETAIL_NOTFOUND,            /* no matching function */
  37         FUNCDETAIL_MULTIPLE,            /* too many matching functions */
  38         FUNCDETAIL_NORMAL,                      /* found a matching regular function */
  39         FUNCDETAIL_AGGREGATE,           /* found a matching aggregate function */
  40         FUNCDETAIL_COERCION                     /* it's a type coercion request */
  41 } FuncDetailCode;
  42
  43
  44 extern Node *ParseFuncOrColumn(ParseState *pstate,
  45                                   List *funcname, List *fargs,
  46                                   bool agg_star, bool agg_distinct, bool func_variadic,
  47                                   bool is_column, int location);
  48
  49 extern FuncDetailCode func_get_detail(List *funcname, List *fargs,
  50                                 int nargs, Oid *argtypes, bool expand_variadic,
  51                                 Oid *funcid, Oid *rettype,
  52                                 bool *retset, int *nvargs, Oid **true_typeids);
  53
  54 extern int func_match_argtypes(int nargs,
  55                                         Oid *input_typeids,
  56                                         FuncCandidateList raw_candidates,
  57                                         FuncCandidateList *candidates);
  58
  59 extern FuncCandidateList func_select_candidate(int nargs,
  60                                           Oid *input_typeids,
  61                                           FuncCandidateList candidates);
  62
  63 extern bool typeInheritsFrom(Oid subclassTypeId, Oid superclassTypeId);
  64
  65 extern void make_fn_arguments(ParseState *pstate,
  66                                   List *fargs,
  67                                   Oid *actual_arg_types,
  68                                   Oid *declared_arg_types);
  69
  70 extern const char *funcname_signature_string(const char *funcname,
  71                                                   int nargs, const Oid *argtypes);
  72 extern const char *func_signature_string(List *funcname,
  73                                           int nargs, const Oid *argtypes);
  74
  75 extern Oid LookupFuncName(List *funcname, int nargs, const Oid *argtypes,
  76                            bool noError);
  77 extern Oid LookupFuncNameTypeNames(List *funcname, List *argtypes,
  78                                                 bool noError);
  79 extern Oid LookupAggNameTypeNames(List *aggname, List *argtypes,
  80                                            bool noError);
  81
  82 #endif   /* PARSE_FUNC_H */