greenplumn CXformLeftSemiJoin2HashJoin 源码
greenplumn CXformLeftSemiJoin2HashJoin 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformLeftSemiJoin2HashJoin.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CXformLeftSemiJoin2HashJoin.h
//
// @doc:
// Transform left semi join to left semi hash join
//---------------------------------------------------------------------------
#ifndef GPOPT_CXformLeftSemiJoin2HashJoin_H
#define GPOPT_CXformLeftSemiJoin2HashJoin_H
#include "gpos/base.h"
#include "gpopt/xforms/CXformImplementation.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CXformLeftSemiJoin2HashJoin
//
// @doc:
// Transform left semi join to left semi hash join
//
//---------------------------------------------------------------------------
class CXformLeftSemiJoin2HashJoin : public CXformImplementation
{
private:
public:
CXformLeftSemiJoin2HashJoin(const CXformLeftSemiJoin2HashJoin &) = delete;
// ctor
explicit CXformLeftSemiJoin2HashJoin(CMemoryPool *mp);
// dtor
~CXformLeftSemiJoin2HashJoin() override = default;
// ident accessors
EXformId
Exfid() const override
{
return ExfLeftSemiJoin2HashJoin;
}
// return a string for xform name
const CHAR *
SzId() const override
{
return "CXformLeftSemiJoin2HashJoin";
}
// 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 CXformLeftSemiJoin2HashJoin
} // namespace gpopt
#endif // !GPOPT_CXformLeftSemiJoin2HashJoin_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