greenplumn CXformImplementInnerJoin 源码
greenplumn CXformImplementInnerJoin 代码
文件路径：/src/backend/gporca/libgpopt/src/xforms/CXformImplementInnerJoin.cpp
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 EMC Corp.
//
// @filename:
// CXformImplementInnerJoin.cpp
//
// @doc:
// Transform inner join to inner Hash Join or Inner Nested Loop Join
// (if a Hash Join is not possible)
//---------------------------------------------------------------------------
#include "gpopt/xforms/CXformImplementInnerJoin.h"
#include "gpos/base.h"
#include "gpopt/operators/CLogicalInnerJoin.h"
#include "gpopt/operators/CPatternLeaf.h"
#include "gpopt/operators/CPhysicalInnerHashJoin.h"
#include "gpopt/operators/CPhysicalInnerNLJoin.h"
#include "gpopt/xforms/CXformUtils.h"
using namespace gpopt;
//---------------------------------------------------------------------------
// @function:
// CXformImplementInnerJoin::CXformImplementInnerJoin
//
// @doc:
// ctor
//
//---------------------------------------------------------------------------
CXformImplementInnerJoin::CXformImplementInnerJoin(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) CPatternTree(mp)) // predicate
))
{
}
//---------------------------------------------------------------------------
// @function:
// CXformImplementInnerJoin::Exfp
//
// @doc:
// Compute xform promise for a given expression handle;
//
//---------------------------------------------------------------------------
CXform::EXformPromise
CXformImplementInnerJoin::Exfp(CExpressionHandle &exprhdl) const
{
return CXformUtils::ExfpLogicalJoin2PhysicalJoin(exprhdl);
}
//---------------------------------------------------------------------------
// @function:
// CXformImplementInnerJoin::Transform
//
// @doc:
// actual transformation
//
//---------------------------------------------------------------------------
void
CXformImplementInnerJoin::Transform(CXformContext *pxfctxt,
CXformResult *pxfres,
CExpression *pexpr) const
{
GPOS_ASSERT(nullptr != pxfctxt);
GPOS_ASSERT(FPromising(pxfctxt->Pmp(), this, pexpr));
GPOS_ASSERT(FCheckPattern(pexpr));
GPOS_ASSERT(pxfres->Size() == 0);
if (GPOPT_FENABLED_XFORM(ExfInnerJoin2HashJoin))
{
CXformUtils::ImplementHashJoin<CPhysicalInnerHashJoin>(pxfctxt, pxfres,
pexpr);
}
if ((GPOS_FTRACE(EopttraceForceComprehensiveJoinImplementation) ||
pxfres->Size() == 0) &&
GPOPT_FENABLED_XFORM(ExfInnerJoin2NLJoin))
{
CXformUtils::ImplementNLJoin<CPhysicalInnerNLJoin>(pxfctxt, pxfres,
pexpr);
}
}
// 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
-
7、 golang
-
9、 openharmony
-
10、 Vue中input框自动聚焦