greenplumn CScalarBooleanTest 源码
greenplumn CScalarBooleanTest 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CScalarBooleanTest.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CScalarBooleanTest.h
//
// @doc:
// Scalar boolean test
//---------------------------------------------------------------------------
#ifndef GPOPT_CScalarBooleanTest_H
#define GPOPT_CScalarBooleanTest_H
#include "gpos/base.h"
#include "gpopt/operators/CScalar.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CScalarBooleanTest
//
// @doc:
// Scalar boolean test operator
//
//---------------------------------------------------------------------------
class CScalarBooleanTest : public CScalar
{
public:
// different boolean test types
enum EBoolTest
{
EbtIsTrue = 0,
EbtIsNotTrue,
EbtIsFalse,
EbtIsNotFalse,
EbtIsUnknown,
EbtIsNotUnknown,
EbtSentinel
};
static const WCHAR m_rgwszBoolTest[EbtSentinel][30];
// mapping operator type and child value into the corresponding result value
static const BYTE m_rgBoolEvalMap[][3];
private:
// boolean test
EBoolTest m_ebt;
public:
CScalarBooleanTest(const CScalarBooleanTest &) = delete;
// ctor
CScalarBooleanTest(CMemoryPool *mp, EBoolTest ebt) : CScalar(mp), m_ebt(ebt)
{
GPOS_ASSERT(0 <= ebt && EbtSentinel > ebt);
}
// dtor
~CScalarBooleanTest() override = default;
// ident accessors
EOperatorId
Eopid() const override
{
return EopScalarBooleanTest;
}
// return a string for operator name
const CHAR *
SzId() const override
{
return "CScalarBooleanTest";
}
// accessor of boolean test type
EBoolTest
Ebt() const
{
return m_ebt;
}
// match function
BOOL Matches(COperator *pop) const override;
// sensitivity to order of inputs
BOOL
FInputOrderSensitive() const override
{
return false;
}
// return a copy of the operator with remapped columns
COperator *
PopCopyWithRemappedColumns(CMemoryPool *, //mp,
UlongToColRefMap *, //colref_mapping,
BOOL //must_exist
) override
{
return PopCopyDefault();
}
// the type of the scalar expression
IMDId *MdidType() const override;
// boolean expression evaluation
EBoolEvalResult Eber(ULongPtrArray *pdrgpulChildren) const override;
// print
IOstream &OsPrint(IOstream &os) const override;
// conversion function
static CScalarBooleanTest *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopScalarBooleanTest == pop->Eopid());
return dynamic_cast<CScalarBooleanTest *>(pop);
}
}; // class CScalarBooleanTest
} // namespace gpopt
#endif // !GPOPT_CScalarBooleanTest_H
// EOF
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