greenplumn CScalarMinMax 代码
文件路径：/src/backend/gporca/libgpopt/src/operators/CScalarMinMax.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2015 VMware, Inc. or its affiliates.
/
/ @filename:
/ CScalarMinMax.cpp
/
/ @doc:
/ Implementation of scalar MinMax operator
/---------------------------------------------------------------------------
#include "gpopt/operators/CScalarMinMax.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:
/ CScalarMinMax::CScalarMinMax
/
/ @doc:
/ Ctor
/
/---------------------------------------------------------------------------
CScalarMinMax::CScalarMinMax(CMemoryPool *mp, IMDId *mdid_type,
EScalarMinMaxType esmmt)
: CScalar(mp),
m_mdid_type(mdid_type),
m_esmmt(esmmt),
m_fBoolReturnType(false)
{
GPOS_ASSERT(mdid_type->IsValid());
GPOS_ASSERT(EsmmtSentinel > esmmt);
CMDAccessor *md_accessor = COptCtxt::PoctxtFromTLS()->Pmda();
m_fBoolReturnType = CMDAccessorUtils::FBoolType(md_accessor, m_mdid_type);
}
/---------------------------------------------------------------------------
/ @function:
/ CScalarMinMax::~CScalarMinMax
/
/ @doc:
/ Dtor
/
/---------------------------------------------------------------------------
CScalarMinMax::~CScalarMinMax()
{
m_mdid_type->Release();
}
/---------------------------------------------------------------------------
/ @function:
/ CScalarMinMax::HashValue
/
/ @doc:
/ Operator specific hash function; combined hash of operator id and
/ return type id
/
/---------------------------------------------------------------------------
ULONG
CScalarMinMax::HashValue() const
{
ULONG ulminmax = (ULONG) this->Esmmt();
return gpos::CombineHashes(
m_mdid_type->HashValue(),
gpos::CombineHashes(COperator::HashValue(),
gpos::HashValue<ULONG>(&ulminmax)));
}
/---------------------------------------------------------------------------
/ @function:
/ CScalarMinMax::Matches
/
/ @doc:
/ Match function on operator level
/
/---------------------------------------------------------------------------
BOOL
CScalarMinMax::Matches(COperator *pop) const
{
if (pop->Eopid() != Eopid())
{
return false;
}
CScalarMinMax *popScMinMax = CScalarMinMax::PopConvert(pop);
/ match if return types are identical
return popScMinMax->Esmmt() == m_esmmt &&
popScMinMax->MdidType()->Equals(m_mdid_type);
}
/---------------------------------------------------------------------------
/ @function:
/ CScalarMinMax::OsPrint
/
/ @doc:
/ debug print
/
/---------------------------------------------------------------------------
IOstream &
CScalarMinMax::OsPrint(IOstream &os) const
{
os << SzId() << " (";
if (EsmmtMin == m_esmmt)
{
os << "Min";
}
else
{
os << "Max";
}
os << ")";
return os;
}
/ EOF
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