text: /* -------------------------------------------------------------------------
   *
   * 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);
  
  #endif /* EXPR_DISTINCT_H */
  