greenplumn CXformResult 源码
greenplumn CXformResult 代码
文件路径：/src/backend/gporca/libgpopt/src/xforms/CXformResult.cpp
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2009 Greenplum, Inc.
//
// @filename:
// CXformResult.cpp
//
// @doc:
// Implementation of result container
//---------------------------------------------------------------------------
#include "gpopt/xforms/CXformResult.h"
#include "gpos/base.h"
using namespace gpopt;
FORCE_GENERATE_DBGSTR(CXformResult);
//---------------------------------------------------------------------------
// @function:
// CXformResult::CXformResult
//
// @doc:
// ctor
//
//---------------------------------------------------------------------------
CXformResult::CXformResult(CMemoryPool *mp) : m_ulExpr(0)
{
GPOS_ASSERT(nullptr != mp);
m_pdrgpexpr = GPOS_NEW(mp) CExpressionArray(mp);
}
//---------------------------------------------------------------------------
// @function:
// CXformResult::~CXformResult
//
// @doc:
// dtor
//
//---------------------------------------------------------------------------
CXformResult::~CXformResult()
{
// release array (releases all elements)
m_pdrgpexpr->Release();
}
//---------------------------------------------------------------------------
// @function:
// CXformResult::Add
//
// @doc:
// add alternative
//
//---------------------------------------------------------------------------
void
CXformResult::Add(CExpression *pexpr)
{
GPOS_ASSERT(0 == m_ulExpr &&
"Incorrect workflow: cannot add further alternatives");
GPOS_ASSERT(nullptr != pexpr);
m_pdrgpexpr->Append(pexpr);
}
//---------------------------------------------------------------------------
// @function:
// CXformResult::PexprNext
//
// @doc:
// retrieve next alternative
//
//---------------------------------------------------------------------------
CExpression *
CXformResult::PexprNext()
{
CExpression *pexpr = nullptr;
if (m_ulExpr < m_pdrgpexpr->Size())
{
pexpr = (*m_pdrgpexpr)[m_ulExpr];
}
GPOS_ASSERT(m_ulExpr <= m_pdrgpexpr->Size());
m_ulExpr++;
return pexpr;
}
//---------------------------------------------------------------------------
// @function:
// CXformResult::OsPrint
//
// @doc:
// debug print
//
//---------------------------------------------------------------------------
IOstream &
CXformResult::OsPrint(IOstream &os) const
{
os << "Alternatives:" << std::endl;
for (ULONG i = 0; i < m_pdrgpexpr->Size(); i++)
{
os << i << ": " << std::endl;
(*m_pdrgpexpr)[i]->OsPrint(os);
}
return os;
}
// EOF
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