greenplumn CXformLeftSemiApplyIn2LeftSemiJoin 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformLeftSemiApplyIn2LeftSemiJoin.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2014 VMware, Inc. or its affiliates.
/
/ @filename:
/ CXformLeftSemiApplyIn2LeftSemiJoin.h
/
/ @doc:
/ Turn Left Semi Apply with IN semantics into Left Semi Join
/---------------------------------------------------------------------------
#ifndef GPOPT_CXformLeftSemiApplyIn2LeftSemiJoin_H
#define GPOPT_CXformLeftSemiApplyIn2LeftSemiJoin_H
#include "gpos/base.h"
#include "gpopt/operators/CLogicalLeftSemiApplyIn.h"
#include "gpopt/operators/CPatternLeaf.h"
#include "gpopt/operators/CPatternTree.h"
#include "gpopt/xforms/CXformLeftSemiApply2LeftSemiJoin.h"
namespace gpopt
{
using namespace gpos;
/---------------------------------------------------------------------------
/ @class:
/ CXformLeftSemiApplyIn2LeftSemiJoin
/
/ @doc:
/ Transform Apply into Join by decorrelating the inner side
/
/---------------------------------------------------------------------------
class CXformLeftSemiApplyIn2LeftSemiJoin
: public CXformLeftSemiApply2LeftSemiJoin
{
private:
public:
CXformLeftSemiApplyIn2LeftSemiJoin(
const CXformLeftSemiApplyIn2LeftSemiJoin &) = delete;
/ ctor
explicit CXformLeftSemiApplyIn2LeftSemiJoin(CMemoryPool *mp)
: CXformLeftSemiApply2LeftSemiJoin(
mp, GPOS_NEW(mp) CExpression(
mp, GPOS_NEW(mp) CLogicalLeftSemiApplyIn(mp),
GPOS_NEW(mp) CExpression(
mp, GPOS_NEW(mp) CPatternLeaf(mp)), / left child
GPOS_NEW(mp) CExpression(
mp, GPOS_NEW(mp) CPatternTree(mp)), / right child
GPOS_NEW(mp) CExpression(
mp, GPOS_NEW(mp) CPatternTree(mp)) / predicate
))
{
}
/ dtor
~CXformLeftSemiApplyIn2LeftSemiJoin() override = default;
/ ident accessors
EXformId
Exfid() const override
{
return ExfLeftSemiApplyIn2LeftSemiJoin;
}
const CHAR *
SzId() const override
{
return "CXformLeftSemiApplyIn2LeftSemiJoin";
}
}; / class CXformLeftSemiApplyIn2LeftSemiJoin
} / namespace gpopt
#endif / !GPOPT_CXformLeftSemiApplyIn2LeftSemiJoin_H
/ EOF
相关信息
相关文章
greenplumn CJoinOrderGreedy 源码
greenplumn CJoinOrderMinCard 源码
greenplumn CSubqueryHandler 源码