greenplumn CDXLScalarOpList 源码
greenplumn CDXLScalarOpList 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLScalarOpList.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2014 VMware, Inc. or its affiliates.
//
// @filename:
// CDXLScalarOpList.h
//
// @doc:
// Class for representing DXL list of scalar expressions
//---------------------------------------------------------------------------
#ifndef GPDXL_CDXLScalarOpList_H
#define GPDXL_CDXLScalarOpList_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLScalar.h"
namespace gpdxl
{
using namespace gpmd;
//---------------------------------------------------------------------------
// @class:
// CDXLScalarOpList
//
// @doc:
// Class for representing DXL list of scalar expressions
//
//---------------------------------------------------------------------------
class CDXLScalarOpList : public CDXLScalar
{
public:
// type of the operator list
enum EdxlOpListType
{
EdxloplistEqFilterList,
EdxloplistFilterList,
EdxloplistGeneral,
EdxloplistSentinel
};
private:
// operator list type
EdxlOpListType m_dxl_op_list_type;
public:
CDXLScalarOpList(const CDXLScalarOpList &) = delete;
// ctor
CDXLScalarOpList(CMemoryPool *mp,
EdxlOpListType dxl_op_list_type = EdxloplistGeneral);
// operator type
Edxlopid GetDXLOperator() const override;
// operator name
const CWStringConst *GetOpNameStr() const override;
// 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 CDXLScalarOpList *
Cast(CDXLOperator *dxl_op)
{
GPOS_ASSERT(nullptr != dxl_op);
GPOS_ASSERT(EdxlopScalarOpList == dxl_op->GetDXLOperator());
return dynamic_cast<CDXLScalarOpList *>(dxl_op);
}
};
} // namespace gpdxl
#endif // !GPDXL_CDXLScalarOpList_H
// EOF
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