greenplumn CXformLeftSemiJoin2InnerJoinUnderGb 源码
greenplumn CXformLeftSemiJoin2InnerJoinUnderGb 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformLeftSemiJoin2InnerJoinUnderGb.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2013 VMware, Inc. or its affiliates.
//
// @filename:
// CXformLeftSemiJoin2InnerJoinUnderGb.h
//
// @doc:
// Transform left semi join to inner join under a groupby
//---------------------------------------------------------------------------
#ifndef GPOPT_CXformLeftSemiJoin2InnerJoinUnderGb_H
#define GPOPT_CXformLeftSemiJoin2InnerJoinUnderGb_H
#include "gpos/base.h"
#include "gpopt/xforms/CXformExploration.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CXformLeftSemiJoin2InnerJoinUnderGb
//
// @doc:
// Transform left semi join to inner join under a groupby
//
//---------------------------------------------------------------------------
class CXformLeftSemiJoin2InnerJoinUnderGb : public CXformExploration
{
private:
public:
CXformLeftSemiJoin2InnerJoinUnderGb(
const CXformLeftSemiJoin2InnerJoinUnderGb &) = delete;
// ctor
explicit CXformLeftSemiJoin2InnerJoinUnderGb(CMemoryPool *mp);
// dtor
~CXformLeftSemiJoin2InnerJoinUnderGb() override = default;
// ident accessors
EXformId
Exfid() const override
{
return ExfLeftSemiJoin2InnerJoinUnderGb;
}
// return a string for xform name
const CHAR *
SzId() const override
{
return "CXformLeftSemiJoin2InnerJoinUnderGb";
}
// 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 CXformLeftSemiJoin2InnerJoinUnderGb
} // namespace gpopt
#endif // !GPOPT_CXformLeftSemiJoin2InnerJoinUnderGb_H
// EOF
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