greenplumn CXformLeftAntiSemiApply2LeftAntiSemiJoinNoCorrelations 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformLeftAntiSemiApply2LeftAntiSemiJoinNoCorrelations.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2012 EMC Corp.
/
/ @filename:
/ CXformLeftAntiSemiApply2LeftAntiSemiJoinNoCorrelations.h
/
/ @doc:
/ Turn LS apply into LS join when inner child has no outer references
/---------------------------------------------------------------------------
#ifndef GPOPT_CXformLeftAntiSemiApply2LeftAntiSemiJoinNoCorrelations_H
#define GPOPT_CXformLeftAntiSemiApply2LeftAntiSemiJoinNoCorrelations_H
#include "gpos/base.h"
#include "gpopt/operators/CLogicalLeftAntiSemiApply.h"
#include "gpopt/operators/CLogicalLeftAntiSemiJoin.h"
#include "gpopt/xforms/CXformApply2Join.h"
namespace gpopt
{
using namespace gpos;
/---------------------------------------------------------------------------
/ @class:
/ CXformLeftAntiSemiApply2LeftAntiSemiJoinNoCorrelations
/
/ @doc:
/ Transform Apply into Join by decorrelating the inner side
/
/---------------------------------------------------------------------------
class CXformLeftAntiSemiApply2LeftAntiSemiJoinNoCorrelations
: public CXformApply2Join<CLogicalLeftAntiSemiApply,
CLogicalLeftAntiSemiJoin>
{
private:
public:
CXformLeftAntiSemiApply2LeftAntiSemiJoinNoCorrelations(
const CXformLeftAntiSemiApply2LeftAntiSemiJoinNoCorrelations &) =
delete;
/ ctor
explicit CXformLeftAntiSemiApply2LeftAntiSemiJoinNoCorrelations(
CMemoryPool *mp)
: CXformApply2Join<CLogicalLeftAntiSemiApply, CLogicalLeftAntiSemiJoin>(
mp)
{
}
/ dtor
~CXformLeftAntiSemiApply2LeftAntiSemiJoinNoCorrelations() override =
default;
/ ident accessors
EXformId
Exfid() const override
{
return ExfLeftAntiSemiApply2LeftAntiSemiJoinNoCorrelations;
}
const CHAR *
SzId() const override
{
return "CXformLeftAntiSemiApply2LeftAntiSemiJoinNoCorrelations";
}
/ compute xform promise for a given expression handle
EXformPromise Exfp(CExpressionHandle &exprhdl) const override;
/ actual transform
void Transform(CXformContext *pxfctxt, CXformResult *pxfres,
CExpression *pexpr) const override;
}; / class CXformLeftAntiSemiApply2LeftAntiSemiJoinNoCorrelations
} / namespace gpopt
#endif / !GPOPT_CXformLeftAntiSemiApply2LeftAntiSemiJoinNoCorrelations_H
/ EOF
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