greenplumn CXformImplementCorrelatedApply 源码
greenplumn CXformImplementCorrelatedApply 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformImplementCorrelatedApply.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CXformImplementCorrelatedApply.h
//
// @doc:
// Base class for implementing correlated NLJ
//---------------------------------------------------------------------------
#ifndef GPOPT_CXformImplementCorrelatedApply_H
#define GPOPT_CXformImplementCorrelatedApply_H
#include "gpos/base.h"
#include "gpopt/operators/CPatternLeaf.h"
#include "gpopt/xforms/CXformImplementation.h"
#include "gpopt/xforms/CXformUtils.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CXformImplementCorrelatedApply
//
// @doc:
// Implement correlated Apply
//
//---------------------------------------------------------------------------
template <class TLogicalApply, class TPhysicalJoin>
class CXformImplementCorrelatedApply : public CXformImplementation
{
private:
public:
CXformImplementCorrelatedApply(const CXformImplementCorrelatedApply &) =
delete;
// ctor
explicit CXformImplementCorrelatedApply(CMemoryPool *mp)
: // pattern
CXformImplementation(GPOS_NEW(mp) CExpression(
mp, GPOS_NEW(mp) TLogicalApply(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
))
{
}
// dtor
~CXformImplementCorrelatedApply() override = default;
EXformPromise
Exfp(CExpressionHandle &exprhdl) const override
{
if (exprhdl.DeriveHasSubquery(2))
{
return CXform::ExfpNone;
}
return CXform::ExfpHigh;
}
// actual transform
void
Transform(CXformContext *pxfctxt, CXformResult *pxfres,
CExpression *pexpr) const override
{
GPOS_ASSERT(nullptr != pxfctxt);
GPOS_ASSERT(FPromising(pxfctxt->Pmp(), this, pexpr));
GPOS_ASSERT(FCheckPattern(pexpr));
CMemoryPool *mp = pxfctxt->Pmp();
// extract components
CExpression *pexprLeft = (*pexpr)[0];
CExpression *pexprRight = (*pexpr)[1];
CExpression *pexprScalar = (*pexpr)[2];
TLogicalApply *popApply = TLogicalApply::PopConvert(pexpr->Pop());
CColRefArray *colref_array = popApply->PdrgPcrInner();
colref_array->AddRef();
// addref all children
pexprLeft->AddRef();
pexprRight->AddRef();
pexprScalar->AddRef();
// assemble physical operator
CExpression *pexprPhysicalApply = GPOS_NEW(mp) CExpression(
mp,
GPOS_NEW(mp)
TPhysicalJoin(mp, colref_array, popApply->EopidOriginSubq()),
pexprLeft, pexprRight, pexprScalar);
// add alternative to results
pxfres->Add(pexprPhysicalApply);
}
}; // class CXformImplementCorrelatedApply
} // namespace gpopt
#endif // !GPOPT_CXformImplementCorrelatedApply_H
// EOF
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