greenplumn CParseHandlerMetadataColumn 源码
greenplumn CParseHandlerMetadataColumn 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/parser/CParseHandlerMetadataColumn.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 Greenplum, Inc.
//
// @filename:
// CParseHandlerMetadataColumn.h
//
// @doc:
// SAX parse handler class for column metadata
//---------------------------------------------------------------------------
#ifndef GPDXL_CParseHandlerMetadataColumn_H
#define GPDXL_CParseHandlerMetadataColumn_H
#include "gpos/base.h"
#include "naucrates/dxl/parser/CParseHandlerBase.h"
#include "naucrates/md/CMDColumn.h"
namespace gpdxl
{
using namespace gpos;
using namespace gpmd;
XERCES_CPP_NAMESPACE_USE
//---------------------------------------------------------------------------
// @class:
// CParseHandlerMetadataColumn
//
// @doc:
// Parse handler for column metadata
//
//---------------------------------------------------------------------------
class CParseHandlerMetadataColumn : public CParseHandlerBase
{
private:
// the metadata column
CMDColumn *m_mdcol;
// column name
CMDName *m_mdname;
// attribute number
INT m_attno;
// attribute type oid
IMDId *m_mdid_type;
INT m_type_modifier;
// are nulls allowed for this column
BOOL m_is_nullable;
// is column dropped
BOOL m_is_dropped;
// default value expression if one exists
CDXLNode *m_dxl_default_val;
// width of the column
ULONG m_width;
// 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:
CParseHandlerMetadataColumn(const CParseHandlerMetadataColumn &) = delete;
// ctor/dtor
CParseHandlerMetadataColumn(CMemoryPool *mp,
CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root);
~CParseHandlerMetadataColumn() override;
CMDColumn *GetMdCol();
};
} // namespace gpdxl
#endif // !GPDXL_CParseHandlerMetadataColumn_H
// EOF
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