greenplumn CXformDynamicGet2DynamicTableScan 源码
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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