greenplumn CXformDelete2DML 源码
greenplumn CXformDelete2DML 代码
文件路径：/src/backend/gporca/libgpopt/src/xforms/CXformDelete2DML.cpp
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CXformDelete2DML.cpp
//
// @doc:
// Implementation of transform
//---------------------------------------------------------------------------
#include "gpopt/xforms/CXformDelete2DML.h"
#include "gpos/base.h"
#include "gpopt/metadata/CTableDescriptor.h"
#include "gpopt/operators/CLogicalDelete.h"
#include "gpopt/operators/CPatternLeaf.h"
#include "gpopt/xforms/CXformUtils.h"
using namespace gpopt;
//---------------------------------------------------------------------------
// @function:
// CXformDelete2DML::CXformDelete2DML
//
// @doc:
// Ctor
//
//---------------------------------------------------------------------------
CXformDelete2DML::CXformDelete2DML(CMemoryPool *mp)
: CXformExploration(
// pattern
GPOS_NEW(mp) CExpression(
mp, GPOS_NEW(mp) CLogicalDelete(mp),
GPOS_NEW(mp) CExpression(mp, GPOS_NEW(mp) CPatternLeaf(mp))))
{
}
//---------------------------------------------------------------------------
// @function:
// CXformDelete2DML::Exfp
//
// @doc:
// Compute promise of xform
//
//---------------------------------------------------------------------------
CXform::EXformPromise
CXformDelete2DML::Exfp(CExpressionHandle & // exprhdl
) const
{
return CXform::ExfpHigh;
}
//---------------------------------------------------------------------------
// @function:
// CXformDelete2DML::Transform
//
// @doc:
// Actual transformation
//
//---------------------------------------------------------------------------
void
CXformDelete2DML::Transform(CXformContext *pxfctxt, CXformResult *pxfres,
CExpression *pexpr) const
{
GPOS_ASSERT(nullptr != pxfctxt);
GPOS_ASSERT(FPromising(pxfctxt->Pmp(), this, pexpr));
GPOS_ASSERT(FCheckPattern(pexpr));
CLogicalDelete *popDelete = CLogicalDelete::PopConvert(pexpr->Pop());
CMemoryPool *mp = pxfctxt->Pmp();
// extract components for alternative
CTableDescriptor *ptabdesc = popDelete->Ptabdesc();
ptabdesc->AddRef();
CColRefArray *colref_array = popDelete->Pdrgpcr();
colref_array->AddRef();
CColRef *pcrCtid = popDelete->PcrCtid();
CColRef *pcrSegmentId = popDelete->PcrSegmentId();
// child of delete operator
CExpression *pexprChild = (*pexpr)[0];
pexprChild->AddRef();
// create logical DML
CExpression *pexprAlt = CXformUtils::PexprLogicalDMLOverProject(
mp, pexprChild, CLogicalDML::EdmlDelete, ptabdesc, colref_array,
pcrCtid, pcrSegmentId);
// add alternative to transformation result
pxfres->Add(pexprAlt);
}
// EOF
相关信息
相关文章
greenplumn CJoinOrderGreedy 源码
greenplumn CJoinOrderMinCard 源码
greenplumn CSubqueryHandler 源码
0
赞
热门推荐
-
2、 - 优质文章
-
3、 gate.io
-
8、 golang
-
9、 openharmony
-
10、 Vue中input框自动聚焦