Bug 166167 ODA IResultSet.close never been called in DtE
In DtE, we will close IConnection and IQuery from ODA, however the IResultSet.close() has never be called so that it is possible that even the ODA connection is closed the IResultSet is still open(If it is not closed when the IQuery or IConnection is closed). This is incorrect and needs a fix.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/executor/transform/CachedResultSet.java
* @throws DataException
	 */
	public CachedResultSet( BaseQuery query, IResultClass meta,
			DataSetResultCache odaCacheResultSet, IEventHandler eventHandler,
			DataEngineSession session )
			throws DataException
	{
		this.handler = eventHandler;
		this.resultSetPopulator = new ResultSetPopulator( query,
				meta,
				this,
				eventHandler,
				session );
		resultSetPopulator.populateResultSet( new OdiResultSetWrapper( odaCacheResultSet ));
		odaCacheResultSet.close( );
	}
	/**
	 * @param query
	 * @param customDataSet
	 * @throws DataException
	 */
	public CachedResultSet( BaseQuery query, ICustomDataSet customDataSet,
			IEventHandler eventHandler,
			DataEngineSession session ) throws DataException
	{
		this.handler = eventHandler;
		assert customDataSet != null;
		this.resultSetPopulator = new ResultSetPopulator( query,
				customDataSet.getResultClass( ),
				this,