greenplumn CDXLScalarSwitch 源码
greenplumn CDXLScalarSwitch 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLScalarSwitch.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CDXLScalarSwitch.h
//
// @doc:
//
// Class for representing DXL Switch (corresponds to Case (expr) ...)
//---------------------------------------------------------------------------
#ifndef GPDXL_CDXLScalarSwitch_H
#define GPDXL_CDXLScalarSwitch_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLScalar.h"
#include "naucrates/md/IMDId.h"
namespace gpdxl
{
using namespace gpos;
using namespace gpmd;
//---------------------------------------------------------------------------
// @class:
// CDXLScalarSwitch
//
// @doc:
// Class for representing DXL Switch
//
//---------------------------------------------------------------------------
class CDXLScalarSwitch : public CDXLScalar
{
private:
// return type
IMDId *m_mdid_type;
public:
CDXLScalarSwitch(const CDXLScalarSwitch &) = delete;
// ctor
CDXLScalarSwitch(CMemoryPool *mp, IMDId *mdid_type);
//dtor
~CDXLScalarSwitch() override;
// name of the operator
const CWStringConst *GetOpNameStr() const override;
// return type
virtual IMDId *MdidType() const;
// DXL Operator ID
Edxlopid GetDXLOperator() const override;
// serialize operator in DXL format
void SerializeToDXL(CXMLSerializer *xml_serializer,
const CDXLNode *dxlnode) const override;
// conversion function
static CDXLScalarSwitch *
Cast(CDXLOperator *dxl_op)
{
GPOS_ASSERT(nullptr != dxl_op);
GPOS_ASSERT(EdxlopScalarSwitch == dxl_op->GetDXLOperator());
return dynamic_cast<CDXLScalarSwitch *>(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, i.e. number and
// types of child nodes
void AssertValid(const CDXLNode *dxlnode,
BOOL validate_children) const override;
#endif // GPOS_DEBUG
};
} // namespace gpdxl
#endif // !GPDXL_CDXLScalarSwitch_H
// EOF
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