greenplumn CXformLeftAntiSemiJoinNotIn2HashJoinNotIn 源码
greenplumn CXformLeftAntiSemiJoinNotIn2HashJoinNotIn 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformLeftAntiSemiJoinNotIn2HashJoinNotIn.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2013 EMC Corp.
//
// @filename:
// CXformLeftAntiSemiJoinNotIn2HashJoinNotIn.h
//
// @doc:
// Transform left anti semi join to left anti semi hash join (NotIn semantics)
//---------------------------------------------------------------------------
#ifndef GPOPT_CXformLeftAntiSemiJoinNotIn2HashJoinNotIn_H
#define GPOPT_CXformLeftAntiSemiJoinNotIn2HashJoinNotIn_H
#include "gpos/base.h"
#include "gpopt/xforms/CXformImplementation.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CXformLeftAntiSemiJoinNotIn2HashJoinNotIn
//
// @doc:
// Transform left semi join to left anti semi hash join (NotIn semantics)
//
//---------------------------------------------------------------------------
class CXformLeftAntiSemiJoinNotIn2HashJoinNotIn : public CXformImplementation
{
private:
public:
CXformLeftAntiSemiJoinNotIn2HashJoinNotIn(
const CXformLeftAntiSemiJoinNotIn2HashJoinNotIn &) = delete;
// ctor
explicit CXformLeftAntiSemiJoinNotIn2HashJoinNotIn(CMemoryPool *mp);
// dtor
~CXformLeftAntiSemiJoinNotIn2HashJoinNotIn() override = default;
// ident accessors
EXformId
Exfid() const override
{
return ExfLeftAntiSemiJoinNotIn2HashJoinNotIn;
}
// return a string for xform name
const CHAR *
SzId() const override
{
return "CXformLeftAntiSemiJoinNotIn2HashJoinNotIn";
}
// 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 CXformLeftAntiSemiJoinNotIn2HashJoinNotIn
} // namespace gpopt
#endif // !GPOPT_CXformLeftAntiSemiJoinNotIn2HashJoinNotIn_H
// EOF
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