greenplumn CScalarAssertConstraint 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CScalarAssertConstraint.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2015 VMware, Inc. or its affiliates.
/
/ @filename:
/ CScalarAssertConstraint.h
/
/ @doc:
/ Class for representing a single scalar assert constraints in physical
/ assert operators. Each node contains a constraint to be checked at
/ runtime, and an error message to print in case the constraint is violated.
/
/ For example:
/ +--CScalarAssertConstraint (ErrorMsg: Check constraint r_c_check for table r violated)
/ +--CScalarIsDistinctFrom (=)
/ |--CScalarCmp (>)
/ | |--CScalarIdent "c" (3)
/ | +--CScalarConst (0)
/ +--CScalarConst (0)
/---------------------------------------------------------------------------
#ifndef GPOPT_CScalarAssertConstraint_H
#define GPOPT_CScalarAssertConstraint_H
#include "gpos/base.h"
#include "gpopt/operators/CScalar.h"
#include "naucrates/md/IMDId.h"
namespace gpopt
{
using namespace gpos;
using namespace gpmd;
/---------------------------------------------------------------------------
/ @class:
/ CScalarAssertConstraint
/
/ @doc:
/ Scalar assert constraint
/
/---------------------------------------------------------------------------
class CScalarAssertConstraint : public CScalar
{
private:
/ error message
CWStringBase *m_pstrErrorMsg;
public:
CScalarAssertConstraint(const CScalarAssertConstraint &) = delete;
/ ctor
CScalarAssertConstraint(CMemoryPool *mp, CWStringBase *pstrErrorMsg);
/ dtor
~CScalarAssertConstraint() override;
/ ident accessors
EOperatorId
Eopid() const override
{
return EopScalarAssertConstraint;
}
/ operator name
const CHAR *
SzId() const override
{
return "CScalarAssertConstraint";
}
/ 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();
}
/ type of expression's result
IMDId *MdidType() const override;
/ error message
CWStringBase *
PstrErrorMsg() const
{
return m_pstrErrorMsg;
}
/ print
IOstream &OsPrint(IOstream &os) const override;
/ conversion function
static CScalarAssertConstraint *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopScalarAssertConstraint == pop->Eopid());
return dynamic_cast<CScalarAssertConstraint *>(pop);
}
}; / class CScalarAssertConstraint
} / namespace gpopt
#endif / !GPOPT_CScalarAssertConstraint_H
/ EOF
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