greenplumn CScalarCoerceToDomain 源码
greenplumn CScalarCoerceToDomain 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CScalarCoerceToDomain.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2014 VMware, Inc. or its affiliates.
//
// @filename:
// CScalarCoerceToDomain.h
//
// @doc:
// Scalar CoerceToDomain operator,
// the operator captures coercing a value to a domain type,
//
// at runtime, the precise set of constraints to be checked against
// value are determined,
// if the value passes, it is returned as the result, otherwise an error
// is raised.
//---------------------------------------------------------------------------
#ifndef GPOPT_CScalarCoerceToDomain_H
#define GPOPT_CScalarCoerceToDomain_H
#include "gpos/base.h"
#include "gpopt/operators/CScalarCoerceBase.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CScalarCoerceToDomain
//
// @doc:
// Scalar CoerceToDomain operator
//
//---------------------------------------------------------------------------
class CScalarCoerceToDomain : public CScalarCoerceBase
{
private:
// does operator return NULL on NULL input?
BOOL m_returns_null_on_null_input;
public:
CScalarCoerceToDomain(const CScalarCoerceToDomain &) = delete;
// ctor
CScalarCoerceToDomain(CMemoryPool *mp, IMDId *mdid_type, INT type_modifier,
ECoercionForm dxl_coerce_format, INT location);
// dtor
~CScalarCoerceToDomain() override = default;
EOperatorId
Eopid() const override
{
return EopScalarCoerceToDomain;
}
// return a string for operator name
const CHAR *
SzId() const override
{
return "CScalarCoerceToDomain";
}
// match function
BOOL Matches(COperator *) const override;
// sensitivity to order of inputs
BOOL
FInputOrderSensitive() const override
{
return false;
}
// boolean expression evaluation
EBoolEvalResult Eber(ULongPtrArray *pdrgpulChildren) const override;
// conversion function
static CScalarCoerceToDomain *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopScalarCoerceToDomain == pop->Eopid());
return dynamic_cast<CScalarCoerceToDomain *>(pop);
}
}; // class CScalarCoerceToDomain
} // namespace gpopt
#endif // !GPOPT_CScalarCoerceToDomain_H
// EOF
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