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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