greenplumn CDXLTranslateContextBaseTable 源码
greenplumn CDXLTranslateContextBaseTable 代码
文件路径：/src/include/gpopt/translate/CDXLTranslateContextBaseTable.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2010 Greenplum, Inc.
//
// @filename:
// CDXLTranslateContextBaseTable.h
//
// @doc:
// Class providing access to translation context for translating base table
// column references, such as mappings from a DXL ColId to a GPDB attribute number in
// the base table schema
//
// @test:
//
//
//---------------------------------------------------------------------------
#ifndef GPDXL_CDXLTranslateContextBaseTable_H
#define GPDXL_CDXLTranslateContextBaseTable_H
#include "gpos/base.h"
#include "gpos/common/CHashMap.h"
extern "C" {
#include "postgres.h" // Index
}
#include "naucrates/dxl/gpdb_types.h"
namespace gpdxl
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CDXLTranslateContextBaseTable
//
// @doc:
// Class providing access to translation context, such as mappings between
// ColIds and target entries
//
//---------------------------------------------------------------------------
class CDXLTranslateContextBaseTable
{
// hash maps mapping ULONG -> INT
using UlongToIntMap =
CHashMap<ULONG, INT, gpos::HashValue<ULONG>, gpos::Equals<ULONG>,
CleanupDelete<ULONG>, CleanupDelete<INT>>;
private:
CMemoryPool *m_mp;
// oid of the base table
OID m_oid;
// index of the relation in the rtable
Index m_rel_index;
// maps a colid of a column to the attribute number of that column in the schema of the underlying relation
UlongToIntMap *m_colid_to_attno_map;
public:
CDXLTranslateContextBaseTable(const CDXLTranslateContextBaseTable &) =
delete;
// ctor/dtor
explicit CDXLTranslateContextBaseTable(CMemoryPool *mp);
~CDXLTranslateContextBaseTable();
// accessors
OID GetOid() const;
Index GetRelIndex() const;
// return the index of the column in the base relation for the given DXL ColId
INT GetAttnoForColId(ULONG dxl_colid) const;
// setters
void SetOID(OID oid);
void SetRelIndex(Index rel_index);
// store the mapping of the given DXL column id and index in the base relation schema
BOOL InsertMapping(ULONG dxl_colid, INT att_no);
};
} // namespace gpdxl
#endif // !GPDXL_CDXLTranslateContextBaseTable_H
// EOF
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