greenplumn CXformIntersectAll2LeftSemiJoin 源码
greenplumn CXformIntersectAll2LeftSemiJoin 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformIntersectAll2LeftSemiJoin.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CXformIntersectAll2LeftSemiJoin.h
//
// @doc:
// Class to transform of CLogicalIntersectAll into a left semi join
//---------------------------------------------------------------------------
#ifndef GPOPT_CXformIntersectAll2LeftSemiJoin_H
#define GPOPT_CXformIntersectAll2LeftSemiJoin_H
#include "gpos/base.h"
#include "gpopt/xforms/CXformExploration.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CXformIntersectAll2LeftSemiJoin
//
// @doc:
// Class to transform of CLogicalIntersectAll into a left semi join
//
//---------------------------------------------------------------------------
class CXformIntersectAll2LeftSemiJoin : public CXformExploration
{
private:
public:
CXformIntersectAll2LeftSemiJoin(const CXformIntersectAll2LeftSemiJoin &) =
delete;
// ctor
explicit CXformIntersectAll2LeftSemiJoin(CMemoryPool *mp);
// dtor
~CXformIntersectAll2LeftSemiJoin() override = default;
// ident accessors
EXformId
Exfid() const override
{
return ExfIntersectAll2LeftSemiJoin;
}
// return a string for xform name
const CHAR *
SzId() const override
{
return "CXformIntersectAll2LeftSemiJoin";
}
// compute xform promise for a given expression handle
EXformPromise
Exfp(CExpressionHandle & // exprhdl
) const override
{
return CXform::ExfpHigh;
}
// actual transform
void Transform(CXformContext *pxfctxt, CXformResult *pxfres,
CExpression *pexpr) const override;
}; // class CXformIntersectAll2LeftSemiJoin
} // namespace gpopt
#endif // !GPOPT_CXformIntersectAll2LeftSemiJoin_H
// EOF
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