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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