greenplumn CXformLeftAntiSemiApply2LeftAntiSemiJoinNoCorrelations 源码
greenplumn CXformLeftAntiSemiApply2LeftAntiSemiJoinNoCorrelations 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformLeftAntiSemiApply2LeftAntiSemiJoinNoCorrelations.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CXformLeftAntiSemiApply2LeftAntiSemiJoinNoCorrelations.h
//
// @doc:
// Turn LS apply into LS join when inner child has no outer references
//---------------------------------------------------------------------------
#ifndef GPOPT_CXformLeftAntiSemiApply2LeftAntiSemiJoinNoCorrelations_H
#define GPOPT_CXformLeftAntiSemiApply2LeftAntiSemiJoinNoCorrelations_H
#include "gpos/base.h"
#include "gpopt/operators/CLogicalLeftAntiSemiApply.h"
#include "gpopt/operators/CLogicalLeftAntiSemiJoin.h"
#include "gpopt/xforms/CXformApply2Join.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CXformLeftAntiSemiApply2LeftAntiSemiJoinNoCorrelations
//
// @doc:
// Transform Apply into Join by decorrelating the inner side
//
//---------------------------------------------------------------------------
class CXformLeftAntiSemiApply2LeftAntiSemiJoinNoCorrelations
: public CXformApply2Join<CLogicalLeftAntiSemiApply,
CLogicalLeftAntiSemiJoin>
{
private:
public:
CXformLeftAntiSemiApply2LeftAntiSemiJoinNoCorrelations(
const CXformLeftAntiSemiApply2LeftAntiSemiJoinNoCorrelations &) =
delete;
// ctor
explicit CXformLeftAntiSemiApply2LeftAntiSemiJoinNoCorrelations(
CMemoryPool *mp)
: CXformApply2Join<CLogicalLeftAntiSemiApply, CLogicalLeftAntiSemiJoin>(
mp)
{
}
// dtor
~CXformLeftAntiSemiApply2LeftAntiSemiJoinNoCorrelations() override =
default;
// ident accessors
EXformId
Exfid() const override
{
return ExfLeftAntiSemiApply2LeftAntiSemiJoinNoCorrelations;
}
const CHAR *
SzId() const override
{
return "CXformLeftAntiSemiApply2LeftAntiSemiJoinNoCorrelations";
}
// compute xform promise for a given expression handle
EXformPromise Exfp(CExpressionHandle &exprhdl) const override;
// actual transform
void Transform(CXformContext *pxfctxt, CXformResult *pxfres,
CExpression *pexpr) const override;
}; // class CXformLeftAntiSemiApply2LeftAntiSemiJoinNoCorrelations
} // namespace gpopt
#endif // !GPOPT_CXformLeftAntiSemiApply2LeftAntiSemiJoinNoCorrelations_H
// 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