greenplumn CXformExpandNAryJoin 源码
greenplumn CXformExpandNAryJoin 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformExpandNAryJoin.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 EMC Corp.
//
// @filename:
// CXformExpandNAryJoin.h
//
// @doc:
// Expand n-ary join into series of binary joins
//---------------------------------------------------------------------------
#ifndef GPOPT_CXformExpandNAryJoin_H
#define GPOPT_CXformExpandNAryJoin_H
#include "gpos/base.h"
#include "gpopt/xforms/CXformExploration.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CXformExpandNAryJoin
//
// @doc:
// Expand n-ary join into series of binary joins
//
//---------------------------------------------------------------------------
class CXformExpandNAryJoin : public CXformExploration
{
private:
public:
CXformExpandNAryJoin(const CXformExpandNAryJoin &) = delete;
// ctor
explicit CXformExpandNAryJoin(CMemoryPool *mp);
// dtor
~CXformExpandNAryJoin() override = default;
// ident accessors
EXformId
Exfid() const override
{
return ExfExpandNAryJoin;
}
// return a string for xform name
const CHAR *
SzId() const override
{
return "CXformExpandNAryJoin";
}
// 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 CXformExpandNAryJoin
} // namespace gpopt
#endif // !GPOPT_CXformExpandNAryJoin_H
// EOF
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