greenplumn CXformLeftSemiApplyIn2LeftSemiJoin 源码
greenplumn CXformLeftSemiApplyIn2LeftSemiJoin 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformLeftSemiApplyIn2LeftSemiJoin.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2014 VMware, Inc. or its affiliates.
//
// @filename:
// CXformLeftSemiApplyIn2LeftSemiJoin.h
//
// @doc:
// Turn Left Semi Apply with IN semantics into Left Semi Join
//---------------------------------------------------------------------------
#ifndef GPOPT_CXformLeftSemiApplyIn2LeftSemiJoin_H
#define GPOPT_CXformLeftSemiApplyIn2LeftSemiJoin_H
#include "gpos/base.h"
#include "gpopt/operators/CLogicalLeftSemiApplyIn.h"
#include "gpopt/operators/CPatternLeaf.h"
#include "gpopt/operators/CPatternTree.h"
#include "gpopt/xforms/CXformLeftSemiApply2LeftSemiJoin.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CXformLeftSemiApplyIn2LeftSemiJoin
//
// @doc:
// Transform Apply into Join by decorrelating the inner side
//
//---------------------------------------------------------------------------
class CXformLeftSemiApplyIn2LeftSemiJoin
: public CXformLeftSemiApply2LeftSemiJoin
{
private:
public:
CXformLeftSemiApplyIn2LeftSemiJoin(
const CXformLeftSemiApplyIn2LeftSemiJoin &) = delete;
// ctor
explicit CXformLeftSemiApplyIn2LeftSemiJoin(CMemoryPool *mp)
: CXformLeftSemiApply2LeftSemiJoin(
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
~CXformLeftSemiApplyIn2LeftSemiJoin() override = default;
// ident accessors
EXformId
Exfid() const override
{
return ExfLeftSemiApplyIn2LeftSemiJoin;
}
const CHAR *
SzId() const override
{
return "CXformLeftSemiApplyIn2LeftSemiJoin";
}
}; // class CXformLeftSemiApplyIn2LeftSemiJoin
} // namespace gpopt
#endif // !GPOPT_CXformLeftSemiApplyIn2LeftSemiJoin_H
// EOF
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