greenplumn CScalarCast 源码
greenplumn CScalarCast 代码
文件路径:/src/backend/gporca/libgpopt/src/operators/CScalarCast.cpp
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 EMC Corp.
//
// @filename:
// CScalarCast.cpp
//
// @doc:
// Implementation of scalar relabel type operator
//---------------------------------------------------------------------------
#include "gpopt/operators/CScalarCast.h"
#include "gpos/base.h"
#include "gpopt/base/CColRefSet.h"
#include "gpopt/base/CDrvdPropScalar.h"
#include "gpopt/base/COptCtxt.h"
#include "gpopt/mdcache/CMDAccessorUtils.h"
#include "gpopt/operators/CExpressionHandle.h"
#include "naucrates/md/IMDTypeBool.h"
using namespace gpopt;
using namespace gpmd;
//---------------------------------------------------------------------------
// @function:
// CScalarCast::CScalarCast
//
// @doc:
// Ctor
//
//---------------------------------------------------------------------------
CScalarCast::CScalarCast(CMemoryPool *mp, IMDId *return_type_mdid,
IMDId *mdid_func, BOOL is_binary_coercible)
: CScalar(mp),
m_return_type_mdid(return_type_mdid),
m_func_mdid(mdid_func),
m_is_binary_coercible(is_binary_coercible),
m_returns_null_on_null_input(false),
m_fBoolReturnType(false)
{
if (nullptr != m_func_mdid && m_func_mdid->IsValid())
{
CMDAccessor *md_accessor = COptCtxt::PoctxtFromTLS()->Pmda();
const IMDFunction *pmdfunc = md_accessor->RetrieveFunc(m_func_mdid);
m_returns_null_on_null_input = pmdfunc->IsStrict();
m_fBoolReturnType =
CMDAccessorUtils::FBoolType(md_accessor, m_return_type_mdid);
}
}
//---------------------------------------------------------------------------
// @function:
// CScalarCast::Matches
//
// @doc:
// Match function on operator level
//
//---------------------------------------------------------------------------
BOOL
CScalarCast::Matches(COperator *pop) const
{
if (pop->Eopid() == Eopid())
{
CScalarCast *pscop = CScalarCast::PopConvert(pop);
// match if the return type oids are identical
return pscop->MdidType()->Equals(m_return_type_mdid) &&
((!IMDId::IsValid(pscop->FuncMdId()) &&
!IMDId::IsValid(m_func_mdid)) ||
pscop->FuncMdId()->Equals(m_func_mdid));
}
return false;
}
// EOF
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