*
* expr_distinct.h
* functions for get number of distinct of expressions.
*
* Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
* Copyright (c) Huawei Technologies Co., Ltd. 2012-2021. All rights reserved.
*
* src/include/utils/expr_distinct.h
*
* -------------------------------------------------------------------------
*/
#ifndef EXPR_DISTINCT_H
#define EXPR_DISTINCT_H
#include "postgres.h"
#include "nodes/relation.h"
#include "utils/selfuncs.h"
#include "utils/be_module.h"
extern double GetExprNumDistinctRouter(VariableStatData *varData, bool needAdjust, STATS_EST_TYPE eType,
bool isJoinVar);
extern bool IsFunctionTransferNumDistinct(FuncExpr *funcExpr);
* The array collects all of the type-cast functions which can transfer number of distinct from any one of
* its arguments, other parameters are viewed as Const.
*/
extern Oid g_typeCastFuncOids[];
#endif
