greenplumn CXformInnerJoin2NLJoin 代码
文件路径：/src/backend/gporca/libgpopt/src/xforms/CXformInnerJoin2NLJoin.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2009 Greenplum, Inc.
/
/ @filename:
/ CXformInnerJoin2NLJoin.cpp
/
/ @doc:
/ Implementation of transform
/---------------------------------------------------------------------------
#include "gpopt/xforms/CXformInnerJoin2NLJoin.h"
#include "gpos/base.h"
#include "gpopt/operators/CLogicalInnerJoin.h"
#include "gpopt/operators/CPatternLeaf.h"
#include "gpopt/operators/CPhysicalInnerNLJoin.h"
#include "gpopt/xforms/CXformInnerJoin2HashJoin.h"
#include "gpopt/xforms/CXformUtils.h"
using namespace gpopt;
/---------------------------------------------------------------------------
/ @function:
/ CXformInnerJoin2NLJoin::CXformInnerJoin2NLJoin
/
/ @doc:
/ ctor
/
/---------------------------------------------------------------------------
CXformInnerJoin2NLJoin::CXformInnerJoin2NLJoin(CMemoryPool *mp)
: / pattern
CXformImplementation(GPOS_NEW(mp) CExpression(
mp, GPOS_NEW(mp) CLogicalInnerJoin(mp),
GPOS_NEW(mp)
CExpression(mp, GPOS_NEW(mp) CPatternLeaf(mp)), / left child
GPOS_NEW(mp)
CExpression(mp, GPOS_NEW(mp) CPatternLeaf(mp)), / right child
GPOS_NEW(mp)
CExpression(mp, GPOS_NEW(mp) CPatternLeaf(mp)) / predicate
))
{
}
/---------------------------------------------------------------------------
/ @function:
/ CXformInnerJoin2NLJoin::Exfp
/
/ @doc:
/ Compute xform promise for a given expression handle;
/
/---------------------------------------------------------------------------
CXform::EXformPromise
CXformInnerJoin2NLJoin::Exfp(CExpressionHandle &) const
{
return CXform::ExfpNone;
}
/---------------------------------------------------------------------------
/ @function:
/ CXformInnerJoin2NLJoin::Transform
/
/ @doc:
/ actual transformation
/ Deprecated in favor of CXformImplementInnerJoin.
/
/---------------------------------------------------------------------------
void
CXformInnerJoin2NLJoin::Transform(CXformContext *, CXformResult *,
CExpression *) const
{
}
/ EOF
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