greenplumn CParseHandlerScalarCoalesce 源码
greenplumn CParseHandlerScalarCoalesce 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/parser/CParseHandlerScalarCoalesce.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CParseHandlerScalarCoalesce.h
//
// @doc:
//
// SAX parse handler class for parsing coalesce operator
//---------------------------------------------------------------------------
#ifndef GPDXL_CParseHandlerScalarCoalesce_H
#define GPDXL_CParseHandlerScalarCoalesce_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLScalarCoalesce.h"
#include "naucrates/dxl/parser/CParseHandlerScalarOp.h"
namespace gpdxl
{
using namespace gpos;
XERCES_CPP_NAMESPACE_USE
//---------------------------------------------------------------------------
// @class:
// CParseHandlerScalarCoalesce
//
// @doc:
// Parse handler for parsing a coalesce operator
//
//---------------------------------------------------------------------------
class CParseHandlerScalarCoalesce : public CParseHandlerScalarOp
{
private:
// return type
IMDId *m_mdid_type;
// process the start of an element
void StartElement(const XMLCh *const element_uri,
const XMLCh *const element_local_name,
const XMLCh *const element_qname,
const Attributes &attr) override;
// process the end of an element
void EndElement(const XMLCh *const element_uri,
const XMLCh *const element_local_name,
const XMLCh *const element_qname) override;
public:
CParseHandlerScalarCoalesce(const CParseHandlerScalarCoalesce &) = delete;
// ctor
CParseHandlerScalarCoalesce(CMemoryPool *mp,
CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root);
};
} // namespace gpdxl
#endif // !GPDXL_CParseHandlerScalarCoalesce_H
//EOF
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