greenplumn CScalarSwitch 源码
greenplumn CScalarSwitch 代码
文件路径：/src/backend/gporca/libgpopt/src/operators/CScalarSwitch.cpp
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CScalarSwitch.cpp
//
// @doc:
// Implementation of scalar switch operator
//---------------------------------------------------------------------------
#include "gpopt/operators/CScalarSwitch.h"
#include "gpos/base.h"
#include "gpopt/base/COptCtxt.h"
#include "gpopt/mdcache/CMDAccessorUtils.h"
using namespace gpopt;
using namespace gpmd;
//---------------------------------------------------------------------------
// @function:
// CScalarSwitch::CScalarSwitch
//
// @doc:
// Ctor
//
//---------------------------------------------------------------------------
CScalarSwitch::CScalarSwitch(CMemoryPool *mp, IMDId *mdid_type)
: CScalar(mp), m_mdid_type(mdid_type), m_fBoolReturnType(false)
{
GPOS_ASSERT(mdid_type->IsValid());
CMDAccessor *md_accessor = COptCtxt::PoctxtFromTLS()->Pmda();
m_fBoolReturnType = CMDAccessorUtils::FBoolType(md_accessor, m_mdid_type);
}
//---------------------------------------------------------------------------
// @function:
// CScalarSwitch::~CScalarSwitch
//
// @doc:
// Dtor
//
//---------------------------------------------------------------------------
CScalarSwitch::~CScalarSwitch()
{
m_mdid_type->Release();
}
//---------------------------------------------------------------------------
// @function:
// CScalarSwitch::HashValue
//
// @doc:
// Operator specific hash function; combined hash of operator id and
// return type id
//
//---------------------------------------------------------------------------
ULONG
CScalarSwitch::HashValue() const
{
return gpos::CombineHashes(COperator::HashValue(),
m_mdid_type->HashValue());
}
//---------------------------------------------------------------------------
// @function:
// CScalarSwitch::Matches
//
// @doc:
// Match function on operator level
//
//---------------------------------------------------------------------------
BOOL
CScalarSwitch::Matches(COperator *pop) const
{
if (pop->Eopid() == Eopid())
{
CScalarSwitch *popScSwitch = CScalarSwitch::PopConvert(pop);
// match if return types are identical
return popScSwitch->MdidType()->Equals(m_mdid_type);
}
return false;
}
// EOF
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