greenplumn CDXLScalarAssertConstraint 源码
greenplumn CDXLScalarAssertConstraint 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLScalarAssertConstraint.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2015 VMware, Inc. or its affiliates.
//
// @filename:
// CDXLScalarAssertConstraint.h
//
// @doc:
// Class for representing DXL scalar assert constraints
//---------------------------------------------------------------------------
#ifndef GPDXL_CDXLScalarAssertConstraint_H
#define GPDXL_CDXLScalarAssertConstraint_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLScalar.h"
#include "naucrates/md/IMDId.h"
namespace gpdxl
{
using namespace gpmd;
//---------------------------------------------------------------------------
// @class:
// CDXLScalarAssertConstraint
//
// @doc:
// Class for representing individual DXL scalar assert constraints
//
//---------------------------------------------------------------------------
class CDXLScalarAssertConstraint : public CDXLScalar
{
private:
// error message
CWStringBase *m_error_msg;
public:
CDXLScalarAssertConstraint(const CDXLScalarAssertConstraint &) = delete;
// ctor
CDXLScalarAssertConstraint(CMemoryPool *mp, CWStringBase *error_msg);
// dtor
~CDXLScalarAssertConstraint() override;
// ident accessors
Edxlopid GetDXLOperator() const override;
// operator name
const CWStringConst *GetOpNameStr() const override;
// error message
CWStringBase *GetErrorMsgStr() const;
// serialize operator in DXL format
void SerializeToDXL(CXMLSerializer *xml_serializer,
const CDXLNode *dxlnode) const override;
// does the operator return a boolean result
BOOL
HasBoolResult(CMDAccessor * //md_accessor
) const override
{
return false;
}
#ifdef GPOS_DEBUG
// checks whether the operator has valid structure, i.e. number and
// types of child nodes
void AssertValid(const CDXLNode *dxlnode,
BOOL validate_children) const override;
#endif // GPOS_DEBUG
// conversion function
static CDXLScalarAssertConstraint *
Cast(CDXLOperator *dxl_op)
{
GPOS_ASSERT(nullptr != dxl_op);
GPOS_ASSERT(EdxlopScalarAssertConstraint == dxl_op->GetDXLOperator());
return dynamic_cast<CDXLScalarAssertConstraint *>(dxl_op);
}
};
} // namespace gpdxl
#endif // !GPDXL_CDXLScalarAssertConstraint_H
// EOF
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