greenplumn CXformResult 源码
greenplumn CXformResult 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformResult.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2009 Greenplum, Inc.
//
// @filename:
// CXformResult.h
//
// @doc:
// Result container for all transformations
//---------------------------------------------------------------------------
#ifndef GPOPT_CXformResult_H
#define GPOPT_CXformResult_H
#include "gpos/base.h"
#include "gpopt/operators/CExpression.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CXformResult
//
// @doc:
// result container
//
//---------------------------------------------------------------------------
class CXformResult : public CRefCount, public DbgPrintMixin<CXformResult>
{
private:
// set of alternatives
CExpressionArray *m_pdrgpexpr;
// cursor for retrieval
ULONG m_ulExpr;
public:
CXformResult(const CXformResult &) = delete;
// ctor
explicit CXformResult(CMemoryPool *);
// dtor
~CXformResult() override;
// accessor
inline CExpressionArray *
Pdrgpexpr() const
{
return m_pdrgpexpr;
}
// add alternative
void Add(CExpression *pexpr);
// retrieve next alternative
CExpression *PexprNext();
// print function
IOstream &OsPrint(IOstream &os) const;
ULONG
Size() const
{
return m_pdrgpexpr->Size();
}
}; // class CXformResult
// shorthand for printing
inline IOstream &
operator<<(IOstream &os, CXformResult &xfres)
{
return xfres.OsPrint(os);
}
} // namespace gpopt
#endif // !GPOPT_CXformResult_H
// EOF
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