greenplumn CXformInnerApply2InnerJoin 源码
greenplumn CXformInnerApply2InnerJoin 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformInnerApply2InnerJoin.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 EMC Corp.
//
// @filename:
// CXformInnerApply2InnerJoin.h
//
// @doc:
// Turn inner apply into inner join
//---------------------------------------------------------------------------
#ifndef GPOPT_CXformInnerApply2InnerJoin_H
#define GPOPT_CXformInnerApply2InnerJoin_H
#include "gpos/base.h"
#include "gpopt/operators/CLogicalInnerApply.h"
#include "gpopt/operators/CLogicalInnerJoin.h"
#include "gpopt/xforms/CXformApply2Join.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CXformInnerApply2InnerJoin
//
// @doc:
// Transform Apply into Join by decorrelating the inner side
//
//---------------------------------------------------------------------------
class CXformInnerApply2InnerJoin
: public CXformApply2Join<CLogicalInnerApply, CLogicalInnerJoin>
{
private:
public:
CXformInnerApply2InnerJoin(const CXformInnerApply2InnerJoin &) = delete;
// ctor
explicit CXformInnerApply2InnerJoin(CMemoryPool *mp)
: CXformApply2Join<CLogicalInnerApply, CLogicalInnerJoin>(
mp, true /*fDeepTree*/)
{
}
// dtor
~CXformInnerApply2InnerJoin() override = default;
// ident accessors
EXformId
Exfid() const override
{
return ExfInnerApply2InnerJoin;
}
const CHAR *
SzId() const override
{
return "CXformInnerApply2InnerJoin";
}
// 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 CXformInnerApply2InnerJoin
} // namespace gpopt
#endif // !GPOPT_CXformInnerApply2InnerJoin_H
// EOF
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