greenplumn CXformImplementAssert 源码
greenplumn CXformImplementAssert 代码
文件路径：/src/backend/gporca/libgpopt/src/xforms/CXformImplementAssert.cpp
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CXformImplementAssert.cpp
//
// @doc:
// Implementation of transform
//---------------------------------------------------------------------------
#include "gpopt/xforms/CXformImplementAssert.h"
#include "gpos/base.h"
#include "gpopt/operators/CLogicalAssert.h"
#include "gpopt/operators/CPatternLeaf.h"
#include "gpopt/operators/CPhysicalAssert.h"
using namespace gpopt;
//---------------------------------------------------------------------------
// @function:
// CXformImplementAssert::CXformImplementAssert
//
// @doc:
// Ctor
//
//---------------------------------------------------------------------------
CXformImplementAssert::CXformImplementAssert(CMemoryPool *mp)
: // pattern
CXformImplementation(GPOS_NEW(mp) CExpression(
mp, GPOS_NEW(mp) CLogicalAssert(mp),
GPOS_NEW(mp) CExpression(
mp, GPOS_NEW(mp) CPatternLeaf(mp)), // relational child
GPOS_NEW(mp)
CExpression(mp, GPOS_NEW(mp) CPatternLeaf(mp)) // predicate
))
{
}
//---------------------------------------------------------------------------
// @function:
// CXformImplementAssert::Exfp
//
// @doc:
// Compute xform promise level for a given expression handle;
//
//---------------------------------------------------------------------------
CXform::EXformPromise
CXformImplementAssert::Exfp(CExpressionHandle &exprhdl) const
{
if (exprhdl.DeriveHasSubquery(1))
{
return CXform::ExfpNone;
}
return CXform::ExfpHigh;
}
//---------------------------------------------------------------------------
// @function:
// CXformImplementAssert::Transform
//
// @doc:
// Actual transformation
//
//---------------------------------------------------------------------------
void
CXformImplementAssert::Transform(CXformContext *pxfctxt, CXformResult *pxfres,
CExpression *pexpr) const
{
GPOS_ASSERT(nullptr != pxfctxt);
GPOS_ASSERT(FPromising(pxfctxt->Pmp(), this, pexpr));
GPOS_ASSERT(FCheckPattern(pexpr));
CMemoryPool *mp = pxfctxt->Pmp();
// extract components
CLogicalAssert *popAssert = CLogicalAssert::PopConvert(pexpr->Pop());
CExpression *pexprRelational = (*pexpr)[0];
CExpression *pexprScalar = (*pexpr)[1];
CException *pexc = popAssert->Pexc();
// addref all children
pexprRelational->AddRef();
pexprScalar->AddRef();
// assemble physical operator
CPhysicalAssert *popPhysicalAssert = GPOS_NEW(mp) CPhysicalAssert(
mp, GPOS_NEW(mp) CException(pexc->Major(), pexc->Minor(),
pexc->Filename(), pexc->Line()));
CExpression *pexprAssert = GPOS_NEW(mp)
CExpression(mp, popPhysicalAssert, pexprRelational, pexprScalar);
// add alternative to results
pxfres->Add(pexprAssert);
}
// EOF
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