greenplumn CParseHandlerScalarSubPlanParam 源码
greenplumn CParseHandlerScalarSubPlanParam 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/parser/CParseHandlerScalarSubPlanParam.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CParseHandlerScalarSubPlanParam.h
//
// @doc:
//
// SAX parse handler class for parsing a single Param of a SubPlan
//---------------------------------------------------------------------------
#ifndef GPDXL_CParseHandlerScalarSubPlanParam_H
#define GPDXL_CParseHandlerScalarSubPlanParam_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLColRef.h"
#include "naucrates/dxl/parser/CParseHandlerScalarOp.h"
namespace gpdxl
{
using namespace gpos;
XERCES_CPP_NAMESPACE_USE
//---------------------------------------------------------------------------
// @class:
// CParseHandlerScalarSubPlanParam
//
// @doc:
// Parse handler for parsing a Param of a scalar SubPlan
//
//---------------------------------------------------------------------------
class CParseHandlerScalarSubPlanParam : public CParseHandlerScalarOp
{
private:
// column reference
CDXLColRef *m_dxl_colref;
// process the start of an element
void StartElement(
const XMLCh *const element_uri, // URI of element's namespace
const XMLCh *const element_local_name, // local part of element's name
const XMLCh *const element_qname, // element's qname
const Attributes &attr // element's attributes
) override;
// process the end of an element
void EndElement(
const XMLCh *const element_uri, // URI of element's namespace
const XMLCh *const element_local_name, // local part of element's name
const XMLCh *const element_qname // element's qname
) override;
public:
CParseHandlerScalarSubPlanParam(const CParseHandlerScalarSubPlanParam &) =
delete;
// ctor/dtor
CParseHandlerScalarSubPlanParam(CMemoryPool *mp,
CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root);
~CParseHandlerScalarSubPlanParam() override;
// return column reference
CDXLColRef *
MakeDXLColRef(void) const
{
return m_dxl_colref;
}
// return param type
IMDId *
MDId(void) const
{
return m_dxl_colref->MdidType();
}
};
} // namespace gpdxl
#endif // GPDXL_CParseHandlerScalarSubPlanParam_H
//EOF
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