greenplumn CColRefSetIter 代码
文件路径：/src/backend/gporca/libgpopt/src/base/CColRefSetIter.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2009 Greenplum, Inc.
/
/ @filename:
/ CColRefSetIter.cpp
/
/ @doc:
/ Implementation of bitset iterator
/---------------------------------------------------------------------------
#include "gpopt/base/CColRefSetIter.h"
#include "gpos/base.h"
#include "gpos/common/CAutoRef.h"
#include "gpopt/base/CAutoOptCtxt.h"
#include "gpopt/base/CColumnFactory.h"
using namespace gpopt;
/---------------------------------------------------------------------------
/ @function:
/ CColRefSetIter::CColRefSetIter
/
/ @doc:
/ ctor
/
/---------------------------------------------------------------------------
CColRefSetIter::CColRefSetIter(const CColRefSet &bs) : CBitSetIter(bs)
{
/ get column factory from optimizer context object
m_pcf = COptCtxt::PoctxtFromTLS()->Pcf();
GPOS_ASSERT(nullptr != m_pcf);
}
/---------------------------------------------------------------------------
/ @function:
/ CColRefSetIter::Pcr
/
/ @doc:
/ Return colref of current position of cursor
/
/---------------------------------------------------------------------------
CColRef *
CColRefSetIter::Pcr() const
{
ULONG id = CBitSetIter::Bit();
/ resolve id through column factory
return m_pcf->LookupColRef(id);
}
/ EOF
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