greenplumn CScalarAssertConstraint 源码
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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