greenplumn CStatsPred 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/statistics/CStatsPred.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2013 EMC Corp.
/
/ @filename:
/ CStatsPred.h
/
/ @doc:
/ Filter on statistics
/---------------------------------------------------------------------------
#ifndef GPNAUCRATES_CStatsPred_H
#define GPNAUCRATES_CStatsPred_H
#include "gpos/base.h"
#include "gpos/common/CDynamicPtrArray.h"
#include "gpos/common/CRefCount.h"
namespace gpnaucrates
{
using namespace gpos;
/---------------------------------------------------------------------------
/ @class:
/ CStatsPred
/
/ @doc:
/ Filter on statistics
/---------------------------------------------------------------------------
class CStatsPred : public CRefCount
{
public:
enum EStatsPredType
{
EsptPoint, / filter with literals
EsptArrayCmp, / filter with = ANY/ALL(ARRAY[...])
EsptConj, / conjunctive filter
EsptDisj, / disjunctive filter
EsptLike, / LIKE filter
EsptUnsupported, / unsupported filter for statistics calculation
EsptSentinel
};
/ comparison types for stats computation
enum EStatsCmpType
{
EstatscmptEq, / equals
EstatscmptNEq, / not equals
EstatscmptL, / less than
EstatscmptLEq, / less or equal to
EstatscmptG, / greater than
EstatscmptGEq, / greater or equal to
EstatscmptIDF, / is distinct from
EstatscmptINDF, / is not distinct from
EstatscmptLike, / LIKE predicate comparison
EstatscmptNotLike, / NOT LIKE predicate comparison
/ NDV comparison for equality predicate on columns with functions, ex f(a) = b or a = f(b)
EstatscmptEqNDV,
EstatscmptOther
};
private:
protected:
/ column id
ULONG m_colid;
public:
CStatsPred &operator=(CStatsPred &) = delete;
CStatsPred(const CStatsPred &) = delete;
/ ctor
explicit CStatsPred(ULONG colid) : m_colid(colid)
{
}
/ dtor
~CStatsPred() override = default;
/ accessors
virtual ULONG
GetColId() const
{
return m_colid;
}
/ type id
virtual EStatsPredType GetPredStatsType() const = 0;
/ comparison function
static inline INT StatsPredSortCmpFunc(const void *val1, const void *val2);
}; / class CStatsPred
/ array of filters
using CStatsPredPtrArry = CDynamicPtrArray<CStatsPred, CleanupRelease>;
/ comparison function for sorting predicates
INT
CStatsPred::StatsPredSortCmpFunc(const void *val1, const void *val2)
{
const CStatsPred *stats_pred1 = *(const CStatsPred **) val1;
const CStatsPred *stats_pred2 = *(const CStatsPred **) val2;
return (INT) stats_pred1->GetColId() - (INT) stats_pred2->GetColId();
}
} / namespace gpnaucrates
#endif / !GPNAUCRATES_CStatsPred_H
/ EOF
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