greenplumn CXformJoinCommutativity 源码
greenplumn CXformJoinCommutativity 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformJoinCommutativity.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 EMC Corp.
//
// @filename:
// CXformJoinCommutativity.h
//
// @doc:
// Transform join by commutativity
//---------------------------------------------------------------------------
#ifndef GPOPT_CXformJoinCommutativity_H
#define GPOPT_CXformJoinCommutativity_H
#include "gpos/base.h"
#include "gpopt/xforms/CXformExploration.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CXformJoinCommutativity
//
// @doc:
// Commutative transformation of join
//
//---------------------------------------------------------------------------
class CXformJoinCommutativity : public CXformExploration
{
private:
public:
CXformJoinCommutativity(const CXformJoinCommutativity &) = delete;
// ctor
explicit CXformJoinCommutativity(CMemoryPool *mp);
// dtor
~CXformJoinCommutativity() override = default;
// ident accessors
EXformId
Exfid() const override
{
return ExfJoinCommutativity;
}
// return a string for xform name
const CHAR *
SzId() const override
{
return "CXformJoinCommutativity";
}
// compatibility function
BOOL FCompatible(CXform::EXformId exfid) override;
// compute xform promise for a given expression handle
EXformPromise
Exfp(CExpressionHandle & // exprhdl
) const override
{
return CXform::ExfpHigh;
}
// actual transform
void Transform(CXformContext *pxfctxt, CXformResult *pxfres,
CExpression *pexpr) const override;
}; // class CXformJoinCommutativity
} // namespace gpopt
#endif // !GPOPT_CXformJoinCommutativity_H
// EOF
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