greenplumn CXformLeftSemiJoin2NLJoin 源码

2022-08-18
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greenplumn CXformLeftSemiJoin2NLJoin 代码

文件路径：/src/backend/gporca/libgpopt/src/xforms/CXformLeftSemiJoin2NLJoin.cpp

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2011 EMC Corp.
//
//	@filename:
//		CXformLeftSemiJoin2NLJoin.cpp
//
//	@doc:
//		Implementation of transform
//---------------------------------------------------------------------------

#include "gpopt/xforms/CXformLeftSemiJoin2NLJoin.h"

#include "gpos/base.h"

#include "gpopt/operators/CLogicalLeftSemiJoin.h"
#include "gpopt/operators/CPatternLeaf.h"
#include "gpopt/operators/CPhysicalLeftSemiNLJoin.h"
#include "gpopt/xforms/CXformUtils.h"


using namespace gpopt;


//---------------------------------------------------------------------------
//	@function:
//		CXformLeftSemiJoin2NLJoin::CXformLeftSemiJoin2NLJoin
//
//	@doc:
//		ctor
//
//---------------------------------------------------------------------------
CXformLeftSemiJoin2NLJoin::CXformLeftSemiJoin2NLJoin(CMemoryPool *mp)
	:  // pattern
	  CXformImplementation(GPOS_NEW(mp) CExpression(
		  mp, GPOS_NEW(mp) CLogicalLeftSemiJoin(mp),
		  GPOS_NEW(mp)
			  CExpression(mp, GPOS_NEW(mp) CPatternLeaf(mp)),  // left child
		  GPOS_NEW(mp)
			  CExpression(mp, GPOS_NEW(mp) CPatternLeaf(mp)),  // right child
		  GPOS_NEW(mp)
			  CExpression(mp, GPOS_NEW(mp) CPatternLeaf(mp)))  // predicate
	  )
{
}


//---------------------------------------------------------------------------
//	@function:
//		CXformLeftSemiJoin2NLJoin::Exfp
//
//	@doc:
//		Compute xform promise for a given expression handle;
//
//---------------------------------------------------------------------------
CXform::EXformPromise
CXformLeftSemiJoin2NLJoin::Exfp(CExpressionHandle &exprhdl) const
{
	return CXformUtils::ExfpLogicalJoin2PhysicalJoin(exprhdl);
}


//---------------------------------------------------------------------------
//	@function:
//		CXformLeftSemiJoin2NLJoin::Transform
//
//	@doc:
//		actual transformation
//
//---------------------------------------------------------------------------
void
CXformLeftSemiJoin2NLJoin::Transform(CXformContext *pxfctxt,
									 CXformResult *pxfres,
									 CExpression *pexpr) const
{
	GPOS_ASSERT(nullptr != pxfctxt);
	GPOS_ASSERT(FPromising(pxfctxt->Pmp(), this, pexpr));
	GPOS_ASSERT(FCheckPattern(pexpr));

	CXformUtils::ImplementNLJoin<CPhysicalLeftSemiNLJoin>(pxfctxt, pxfres,
														  pexpr);
}


// EOF

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