stat_utils.h

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/*-------------------------------------------------------------------------
 *
 * stat_utils.h
 *    Extended statistics and selectivity estimation functions.
 *
 * Portions Copyright (c) 1996-2026, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/statistics/stat_utils.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef STATS_UTILS_H
#define STATS_UTILS_H
 
#include "access/attnum.h"
#include "fmgr.h"
 
/* avoid including primnodes.h here */
typedef struct RangeVar RangeVar;
 
struct StatsArgInfo
{
    const char *argname;
    Oid         argtype;
};
 
extern void stats_check_required_arg(FunctionCallInfo fcinfo,
                                     struct StatsArgInfo *arginfo,
                                     int argnum);
extern bool stats_check_arg_array(FunctionCallInfo fcinfo,
                                  struct StatsArgInfo *arginfo, int argnum);
extern bool stats_check_arg_pair(FunctionCallInfo fcinfo,
                                 struct StatsArgInfo *arginfo,
                                 int argnum1, int argnum2);
 
extern void RangeVarCallbackForStats(const RangeVar *relation,
                                     Oid relId, Oid oldRelId, void *arg);
 
extern bool stats_fill_fcinfo_from_arg_pairs(FunctionCallInfo pairs_fcinfo,
                                             FunctionCallInfo positional_fcinfo,
                                             struct StatsArgInfo *arginfo);
 
extern void statatt_get_type(Oid reloid, AttrNumber attnum,
                             Oid *atttypid, int32 *atttypmod,
                             char *atttyptype, Oid *atttypcoll,
                             Oid *eq_opr, Oid *lt_opr);
extern void statatt_init_empty_tuple(Oid reloid, int16 attnum, bool inherited,
                                     Datum *values, bool *nulls, bool *replaces);
 
extern void statatt_set_slot(Datum *values, bool *nulls, bool *replaces,
                             int16 stakind, Oid staop, Oid stacoll,
                             Datum stanumbers, bool stanumbers_isnull,
                             Datum stavalues, bool stavalues_isnull);
 
extern Datum statatt_build_stavalues(const char *staname, FmgrInfo *array_in, Datum d,
                                     Oid typid, int32 typmod, bool *ok);
extern bool statatt_get_elem_type(Oid atttypid, char atttyptype,
                                  Oid *elemtypid, Oid *elem_eq_opr);
 
#endif                          /* STATS_UTILS_H */