greenplumn CxformSelect2DynamicBitmapBoolOp 源码
greenplumn CxformSelect2DynamicBitmapBoolOp 代码
文件路径：/src/backend/gporca/libgpopt/src/xforms/CxformSelect2DynamicBitmapBoolOp.cpp
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2014 VMware, Inc. or its affiliates.
//
// @filename:
// CXformSelect2DynamicBitmapBoolOp.cpp
//
// @doc:
// Transform select over partitioned table into a dynamic bitmap table get
// over bitmap bool op
//
// @owner:
//
//
// @test:
//
//---------------------------------------------------------------------------
#include "gpopt/xforms/CXformSelect2DynamicBitmapBoolOp.h"
#include "gpopt/operators/CLogicalDynamicGet.h"
#include "gpopt/operators/CLogicalSelect.h"
#include "gpopt/xforms/CXformUtils.h"
using namespace gpmd;
using namespace gpopt;
//---------------------------------------------------------------------------
// @function:
// CXformSelect2DynamicBitmapBoolOp::CXformSelect2DynamicBitmapBoolOp
//
// @doc:
// Ctor
//
//---------------------------------------------------------------------------
CXformSelect2DynamicBitmapBoolOp::CXformSelect2DynamicBitmapBoolOp(
CMemoryPool *mp)
: CXformExploration(GPOS_NEW(mp) CExpression(
mp, GPOS_NEW(mp) CLogicalSelect(mp),
GPOS_NEW(mp) CExpression(
mp, GPOS_NEW(mp) CLogicalDynamicGet(mp)), // logical child
GPOS_NEW(mp)
CExpression(mp, GPOS_NEW(mp) CPatternTree(mp)) // predicate tree
))
{
}
//---------------------------------------------------------------------------
// @function:
// CXformSelect2DynamicBitmapBoolOp::Exfp
//
// @doc:
// Compute xform promise for a given expression handle
//
//---------------------------------------------------------------------------
CXform::EXformPromise
CXformSelect2DynamicBitmapBoolOp::Exfp(CExpressionHandle & // exprhdl
) const
{
return CXform::ExfpHigh;
}
//---------------------------------------------------------------------------
// @function:
// CXformSelect2DynamicBitmapBoolOp::Transform
//
// @doc:
// Actual transformation
//
//---------------------------------------------------------------------------
void
CXformSelect2DynamicBitmapBoolOp::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();
CExpression *pexprResult = CXformUtils::PexprSelect2BitmapBoolOp(mp, pexpr);
if (nullptr != pexprResult)
{
// create a redundant SELECT on top of DynamicIndexGet to be able to use predicate in partition elimination
CExpression *pexprRedundantSelect =
CXformUtils::PexprRedundantSelectForDynamicIndex(mp, pexprResult);
pexprResult->Release();
pxfres->Add(pexprRedundantSelect);
}
}
// EOF
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