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