greenplumn CXformLeftOuterApply2LeftOuterJoinNoCorrelations 源码
greenplumn CXformLeftOuterApply2LeftOuterJoinNoCorrelations 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformLeftOuterApply2LeftOuterJoinNoCorrelations.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CXformLeftOuterApply2LeftOuterJoinNoCorrelations.h
//
// @doc:
// Turn inner Apply into Inner Join when Apply's inner child has no
// correlations
//---------------------------------------------------------------------------
#ifndef GPOPT_CXformLeftOuterApply2LeftOuterJoinNoCorrelations_H
#define GPOPT_CXformLeftOuterApply2LeftOuterJoinNoCorrelations_H
#include "gpos/base.h"
#include "gpopt/operators/CLogicalLeftOuterApply.h"
#include "gpopt/operators/CLogicalLeftOuterJoin.h"
#include "gpopt/xforms/CXformApply2Join.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CXformLeftOuterApply2LeftOuterJoinNoCorrelations
//
// @doc:
// Transform left outer apply into left outer join
//
//---------------------------------------------------------------------------
class CXformLeftOuterApply2LeftOuterJoinNoCorrelations
: public CXformApply2Join<CLogicalLeftOuterApply, CLogicalLeftOuterJoin>
{
private:
public:
CXformLeftOuterApply2LeftOuterJoinNoCorrelations(
const CXformLeftOuterApply2LeftOuterJoinNoCorrelations &) = delete;
// ctor
explicit CXformLeftOuterApply2LeftOuterJoinNoCorrelations(CMemoryPool *mp)
: CXformApply2Join<CLogicalLeftOuterApply, CLogicalLeftOuterJoin>(mp)
{
}
// dtor
~CXformLeftOuterApply2LeftOuterJoinNoCorrelations() override = default;
// ident accessors
EXformId
Exfid() const override
{
return ExfLeftOuterApply2LeftOuterJoinNoCorrelations;
}
const CHAR *
SzId() const override
{
return "CXformLeftOuterApply2LeftOuterJoinNoCorrelations";
}
// 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 CXformLeftOuterApply2LeftOuterJoinNoCorrelations
} // namespace gpopt
#endif // !GPOPT_CXformLeftOuterApply2LeftOuterJoinNoCorrelations_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