greenplumn CDXLScalarConstValue 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLScalarConstValue.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2010 Greenplum, Inc.
/
/ @filename:
/ CDXLScalarConstValue.h
/
/ @doc:
/ Class for representing DXL Const Value
/---------------------------------------------------------------------------
#ifndef GPDXL_CDXLScalarConstValue_H
#define GPDXL_CDXLScalarConstValue_H
#include "gpos/base.h"
#include "naucrates/dxl/gpdb_types.h"
#include "naucrates/dxl/operators/CDXLDatum.h"
#include "naucrates/dxl/operators/CDXLScalar.h"
namespace gpdxl
{
using namespace gpos;
using namespace gpmd;
/---------------------------------------------------------------------------
/ @class:
/ CDXLScalarConstValue
/
/ @doc:
/ Class for representing DXL scalar Const value
/
/---------------------------------------------------------------------------
class CDXLScalarConstValue : public CDXLScalar
{
private:
CDXLDatum *m_dxl_datum;
public:
CDXLScalarConstValue(const CDXLScalarConstValue &) = delete;
/ ctor/dtor
CDXLScalarConstValue(CMemoryPool *mp, CDXLDatum *dxl_datum);
~CDXLScalarConstValue() override;
/ name of the operator
const CWStringConst *GetOpNameStr() const override;
/ return the datum value
const CDXLDatum *
GetDatumVal() const
{
return m_dxl_datum;
}
/ DXL Operator ID
Edxlopid GetDXLOperator() const override;
/ serialize operator in DXL format
void SerializeToDXL(CXMLSerializer *xml_serializer,
const CDXLNode *node) const override;
/ conversion function
static CDXLScalarConstValue *
Cast(CDXLOperator *dxl_op)
{
GPOS_ASSERT(nullptr != dxl_op);
GPOS_ASSERT(EdxlopScalarConstValue == dxl_op->GetDXLOperator());
return dynamic_cast<CDXLScalarConstValue *>(dxl_op);
}
/ does the operator return a boolean result
BOOL HasBoolResult(CMDAccessor *md_accessor) const override;
#ifdef GPOS_DEBUG
/ checks whether the operator has valid structure
void AssertValid(const CDXLNode *dxlnode,
BOOL validate_children) const override;
#endif / GPOS_DEBUG
};
} / namespace gpdxl
#endif / !GPDXL_CDXLScalarConstValue_H
/ EOF
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