greenplumn CStatsPredLike 源码
greenplumn CStatsPredLike 代码
文件路径：/src/backend/gporca/libnaucrates/src/statistics/CStatsPredLike.cpp
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2013 EMC Corp.
//
// @filename:
// CStatsPredLike.cpp
//
// @doc:
// Implementation of statistics LIKE filter
//---------------------------------------------------------------------------
#include "naucrates/statistics/CStatsPredLike.h"
#include "gpopt/operators/CExpression.h"
using namespace gpnaucrates;
using namespace gpopt;
using namespace gpmd;
//---------------------------------------------------------------------------
// @function:
// CStatsPredLike::CStatisticsFilterLike
//
// @doc:
// Ctor
//
//---------------------------------------------------------------------------
CStatsPredLike::CStatsPredLike(ULONG colid, CExpression *expr_left,
CExpression *expr_right,
CDouble default_scale_factor)
: CStatsPred(colid),
m_expr_left(expr_left),
m_expr_right(expr_right),
m_default_scale_factor(default_scale_factor)
{
GPOS_ASSERT(gpos::ulong_max != colid);
GPOS_ASSERT(nullptr != expr_left);
GPOS_ASSERT(nullptr != expr_right);
GPOS_ASSERT(0 < default_scale_factor);
}
//---------------------------------------------------------------------------
// @function:
// CStatsPredLike::~CStatisticsFilterLike
//
// @doc:
// Dtor
//
//---------------------------------------------------------------------------
CStatsPredLike::~CStatsPredLike()
{
m_expr_left->Release();
m_expr_right->Release();
}
//---------------------------------------------------------------------------
// @function:
// CStatsPredLike::GetColId
//
// @doc:
// Return the column identifier on which the predicates are on
//
//---------------------------------------------------------------------------
ULONG
CStatsPredLike::GetColId() const
{
return m_colid;
}
//---------------------------------------------------------------------------
// @function:
// CStatsPredLike::DefaultScaleFactor
//
// @doc:
// Return the default like scale factor
//
//---------------------------------------------------------------------------
CDouble
CStatsPredLike::DefaultScaleFactor() const
{
return m_default_scale_factor;
}
// EOF
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