greenplumn CXformLeftSemiApplyIn2LeftSemiJoinNoCorrelations 源码
greenplumn CXformLeftSemiApplyIn2LeftSemiJoinNoCorrelations 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformLeftSemiApplyIn2LeftSemiJoinNoCorrelations.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2014 VMware, Inc. or its affiliates.
//
// @filename:
// CXformLeftSemiApplyIn2LeftSemiJoinNoCorrelations.h
//
// @doc:
// Turn Left Semi Apply (with IN semantics) into Left Semi join when inner
// child has no outer references
//---------------------------------------------------------------------------
#ifndef GPOPT_CXformLeftSemiApplyIn2LeftSemiJoinNoCorrelations_H
#define GPOPT_CXformLeftSemiApplyIn2LeftSemiJoinNoCorrelations_H
#include "gpos/base.h"
#include "gpopt/xforms/CXformLeftSemiApply2LeftSemiJoinNoCorrelations.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CXformLeftSemiApplyIn2LeftSemiJoinNoCorrelations
//
// @doc:
// Transform Apply into Join by decorrelating the inner side
//
//---------------------------------------------------------------------------
class CXformLeftSemiApplyIn2LeftSemiJoinNoCorrelations
: public CXformLeftSemiApply2LeftSemiJoinNoCorrelations
{
private:
public:
CXformLeftSemiApplyIn2LeftSemiJoinNoCorrelations(
const CXformLeftSemiApplyIn2LeftSemiJoinNoCorrelations &) = delete;
// ctor
explicit CXformLeftSemiApplyIn2LeftSemiJoinNoCorrelations(CMemoryPool *mp)
: CXformLeftSemiApply2LeftSemiJoinNoCorrelations(
mp, GPOS_NEW(mp) CExpression(
mp, GPOS_NEW(mp) CLogicalLeftSemiApplyIn(mp),
GPOS_NEW(mp) CExpression(
mp, GPOS_NEW(mp) CPatternLeaf(mp)), // left child
GPOS_NEW(mp) CExpression(
mp, GPOS_NEW(mp) CPatternTree(mp)), // right child
GPOS_NEW(mp) CExpression(
mp, GPOS_NEW(mp) CPatternTree(mp)) // predicate
))
{
}
// dtor
~CXformLeftSemiApplyIn2LeftSemiJoinNoCorrelations() override = default;
// ident accessors
EXformId
Exfid() const override
{
return ExfLeftSemiApplyIn2LeftSemiJoinNoCorrelations;
}
const CHAR *
SzId() const override
{
return "CXformLeftSemiApplyIn2LeftSemiJoinNoCorrelations";
}
}; // class CXformLeftSemiApplyIn2LeftSemiJoinNoCorrelations
} // namespace gpopt
#endif // !GPOPT_CXformLeftSemiApplyIn2LeftSemiJoinNoCorrelations_H
// EOF
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