greenplumn CXformDynamicIndexGet2DynamicIndexScan 代码
文件路径：/src/backend/gporca/libgpopt/src/xforms/CXformDynamicIndexGet2DynamicIndexScan.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2012 EMC Corp.
/
/ @filename:
/ CXformDynamicIndexGet2DynamicIndexScan.cpp
/
/ @doc:
/ Implementation of transform
/---------------------------------------------------------------------------
#include "gpopt/xforms/CXformDynamicIndexGet2DynamicIndexScan.h"
#include "gpos/base.h"
#include "gpopt/metadata/CPartConstraint.h"
#include "gpopt/metadata/CTableDescriptor.h"
#include "gpopt/operators/CLogicalDynamicIndexGet.h"
#include "gpopt/operators/CPatternLeaf.h"
#include "gpopt/operators/CPhysicalDynamicIndexScan.h"
using namespace gpopt;
/---------------------------------------------------------------------------
/ @function:
/ CXformDynamicIndexGet2DynamicIndexScan::CXformDynamicIndexGet2DynamicIndexScan
/
/ @doc:
/ Ctor
/
/---------------------------------------------------------------------------
CXformDynamicIndexGet2DynamicIndexScan::CXformDynamicIndexGet2DynamicIndexScan(
CMemoryPool *mp)
: CXformImplementation(
/ pattern
GPOS_NEW(mp) CExpression(
mp, GPOS_NEW(mp) CLogicalDynamicIndexGet(mp),
GPOS_NEW(mp) CExpression(
mp, GPOS_NEW(mp) CPatternLeaf(mp)) / index lookup predicate
))
{
}
CXform::EXformPromise
CXformDynamicIndexGet2DynamicIndexScan::Exfp(CExpressionHandle &exprhdl) const
{
if (exprhdl.DeriveHasSubquery(0))
{
return CXform::ExfpNone;
}
return CXform::ExfpHigh;
}
/---------------------------------------------------------------------------
/ @function:
/ CXformDynamicIndexGet2DynamicIndexScan::Transform
/
/ @doc:
/ Actual transformation
/
/---------------------------------------------------------------------------
void
CXformDynamicIndexGet2DynamicIndexScan::Transform(
CXformContext *pxfctxt GPOS_ASSERTS_ONLY, CXformResult *pxfres GPOS_UNUSED,
CExpression *pexpr GPOS_ASSERTS_ONLY) const
{
GPOS_ASSERT(nullptr != pxfctxt);
GPOS_ASSERT(FPromising(pxfctxt->Pmp(), this, pexpr));
GPOS_ASSERT(FCheckPattern(pexpr));
CLogicalDynamicIndexGet *popIndexGet =
CLogicalDynamicIndexGet::PopConvert(pexpr->Pop());
CMemoryPool *mp = pxfctxt->Pmp();
/ create/extract components for alternative
CName *pname = GPOS_NEW(mp) CName(mp, popIndexGet->Name());
GPOS_ASSERT(pname != nullptr);
/ extract components
CExpression *pexprIndexCond = (*pexpr)[0];
pexprIndexCond->AddRef();
CTableDescriptor *ptabdesc = popIndexGet->Ptabdesc();
ptabdesc->AddRef();
CIndexDescriptor *pindexdesc = popIndexGet->Pindexdesc();
pindexdesc->AddRef();
CColRefArray *pdrgpcrOutput = popIndexGet->PdrgpcrOutput();
GPOS_ASSERT(nullptr != pdrgpcrOutput);
pdrgpcrOutput->AddRef();
CColRef2dArray *pdrgpdrgpcrPart = popIndexGet->PdrgpdrgpcrPart();
pdrgpdrgpcrPart->AddRef();
COrderSpec *pos = popIndexGet->Pos();
pos->AddRef();
popIndexGet->GetPartitionMdids()->AddRef();
popIndexGet->GetRootColMappingPerPart()->AddRef();
/ create alternative expression
CExpression *pexprAlt = GPOS_NEW(mp)
CExpression(mp,
GPOS_NEW(mp) CPhysicalDynamicIndexScan(
mp, pindexdesc, ptabdesc, pexpr->Pop()->UlOpId(), pname,
pdrgpcrOutput, popIndexGet->ScanId(), pdrgpdrgpcrPart,
pos, popIndexGet->GetPartitionMdids(),
popIndexGet->GetRootColMappingPerPart()),
pexprIndexCond);
/ add alternative to transformation result
pxfres->Add(pexprAlt);
}
/ EOF
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