greenplumn COperator 代码
文件路径：/src/backend/gporca/libgpopt/src/operators/COperator.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2009 Greenplum, Inc.
/
/ @filename:
/ COperator.cpp
/
/ @doc:
/ Implementation of operator base class
/---------------------------------------------------------------------------
#include "gpopt/operators/COperator.h"
#include "gpos/base.h"
#include "gpopt/base/CDrvdPropRelational.h"
#include "gpopt/base/CReqdPropRelational.h"
#include "gpopt/operators/CExpression.h"
#include "gpopt/operators/CExpressionHandle.h"
using namespace gpopt;
FORCE_GENERATE_DBGSTR(COperator);
/ generate unique operator ids
ULONG COperator::m_aulOpIdCounter(0);
/---------------------------------------------------------------------------
/ @function:
/ COperator::COperator
/
/ @doc:
/ ctor
/
/---------------------------------------------------------------------------
COperator::COperator(CMemoryPool *mp)
: m_ulOpId(m_aulOpIdCounter++), m_mp(mp), m_fPattern(false)
{
GPOS_ASSERT(nullptr != mp);
}
/---------------------------------------------------------------------------
/ @function:
/ COperator::HashValue
/
/ @doc:
/ default hash function based on operator ID
/
/---------------------------------------------------------------------------
ULONG
COperator::HashValue() const
{
ULONG ulEopid = (ULONG) Eopid();
return gpos::HashValue<ULONG>(&ulEopid);
}
/---------------------------------------------------------------------------
/ @function:
/ COperator::OsPrint
/
/ @doc:
/ debug print
/
/---------------------------------------------------------------------------
IOstream &
COperator::OsPrint(IOstream &os) const
{
os << this->SzId();
return os;
}
/---------------------------------------------------------------------------
/ @function:
/ COperator::EfsDeriveFromChildren
/
/ @doc:
/ Derive stability function property from child expressions
/
/---------------------------------------------------------------------------
IMDFunction::EFuncStbl
COperator::EfsDeriveFromChildren(CExpressionHandle &exprhdl,
IMDFunction::EFuncStbl efsDefault)
{
IMDFunction::EFuncStbl efs = efsDefault;
const ULONG arity = exprhdl.Arity();
for (ULONG ul = 0; ul < arity; ul++)
{
IMDFunction::EFuncStbl efsChild = exprhdl.PfpChild(ul)->Efs();
if (efsChild > efs)
{
efs = efsChild;
}
}
return efs;
}
/---------------------------------------------------------------------------
/ @function:
/ COperator::PfpDeriveFromChildren
/
/ @doc:
/ Derive function properties from child expressions
/
/---------------------------------------------------------------------------
CFunctionProp *
COperator::PfpDeriveFromChildren(CMemoryPool *mp, CExpressionHandle &exprhdl,
IMDFunction::EFuncStbl efsDefault,
BOOL fHasVolatileFunctionScan, BOOL fScan)
{
IMDFunction::EFuncStbl efs = EfsDeriveFromChildren(exprhdl, efsDefault);
return GPOS_NEW(mp) CFunctionProp(
efs,
fHasVolatileFunctionScan || exprhdl.FChildrenHaveVolatileFuncScan(),
fScan);
}
/---------------------------------------------------------------------------
/ @function:
/ COperator::PopCopyDefault
/
/ @doc:
/ Return an addref'ed copy of the operator
/
/---------------------------------------------------------------------------
COperator *
COperator::PopCopyDefault()
{
this->AddRef();
return this;
}
/ EOF
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