greenplumn CXformDynamicGet2DynamicTableScan 代码
文件路径：/src/backend/gporca/libgpopt/src/xforms/CXformDynamicGet2DynamicTableScan.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2012 EMC Corp.
/
/ @filename:
/ CXformDynamicGet2DynamicTableScan.cpp
/
/ @doc:
/ Implementation of transform
/---------------------------------------------------------------------------
#include "gpopt/xforms/CXformDynamicGet2DynamicTableScan.h"
#include "gpos/base.h"
#include "gpopt/metadata/CPartConstraint.h"
#include "gpopt/metadata/CTableDescriptor.h"
#include "gpopt/operators/CLogicalDynamicGet.h"
#include "gpopt/operators/CPhysicalDynamicTableScan.h"
using namespace gpopt;
/---------------------------------------------------------------------------
/ @function:
/ CXformDynamicGet2DynamicTableScan::CXformDynamicGet2DynamicTableScan
/
/ @doc:
/ Ctor
/
/---------------------------------------------------------------------------
CXformDynamicGet2DynamicTableScan::CXformDynamicGet2DynamicTableScan(
CMemoryPool *mp)
: CXformImplementation(
/ pattern
GPOS_NEW(mp) CExpression(mp, GPOS_NEW(mp) CLogicalDynamicGet(mp)))
{
}
/---------------------------------------------------------------------------
/ @function:
/ CXformDynamicGet2DynamicTableScan::Transform
/
/ @doc:
/ Actual transformation
/
/---------------------------------------------------------------------------
void
CXformDynamicGet2DynamicTableScan::Transform(CXformContext *pxfctxt,
CXformResult *pxfres,
CExpression *pexpr) const
{
GPOS_ASSERT(nullptr != pxfctxt);
GPOS_ASSERT(FPromising(pxfctxt->Pmp(), this, pexpr));
GPOS_ASSERT(FCheckPattern(pexpr));
CLogicalDynamicGet *popGet = CLogicalDynamicGet::PopConvert(pexpr->Pop());
CMemoryPool *mp = pxfctxt->Pmp();
/ create/extract components for alternative
CName *pname = GPOS_NEW(mp) CName(mp, popGet->Name());
CTableDescriptor *ptabdesc = popGet->Ptabdesc();
ptabdesc->AddRef();
CColRefArray *pdrgpcrOutput = popGet->PdrgpcrOutput();
GPOS_ASSERT(nullptr != pdrgpcrOutput);
pdrgpcrOutput->AddRef();
CColRef2dArray *pdrgpdrgpcrPart = popGet->PdrgpdrgpcrPart();
pdrgpdrgpcrPart->AddRef();
popGet->GetPartitionMdids()->AddRef();
popGet->GetRootColMappingPerPart()->AddRef();
/ create alternative expression
CExpression *pexprAlt = GPOS_NEW(mp) CExpression(
mp, GPOS_NEW(mp) CPhysicalDynamicTableScan(
mp, pname, ptabdesc, popGet->UlOpId(), popGet->ScanId(),
pdrgpcrOutput, pdrgpdrgpcrPart, popGet->GetPartitionMdids(),
popGet->GetRootColMappingPerPart()));
/ add alternative to transformation result
pxfres->Add(pexprAlt);
}
/ EOF
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