Bug 144403 Jion include scripted dataset the result set is not list in the data explorer
Description; Jion include scripted dataset, the result set is not list in the data explorer Step to reproduce: Refer to the design file attached. Jioned with any scripted dataset will cause the problem. Actual result: Refer to the screenshot.
data/org.eclipse.birt.report.data.adapter/src/org/eclipse/birt/report/data/adapter/impl/DataSetMetaDataHelper.java
* @throws BirtException
	 */
	private IResultMetaData getCachedMetaData( CachedMetaDataHandle cmdHandle )
			throws BirtException
	{
		if ( cmdHandle == null )
			return null;
		Iterator it = cmdHandle.getResultSet( ).iterator( );
		List columnMeta = new ArrayList( );
		while ( it.hasNext( ) )
		{
			ResultSetColumnHandle rsColumn = (ResultSetColumnHandle) it.next( );
			IColumnDefinition cd = this.modelAdaptor.ColumnAdaptor( rsColumn );
			columnMeta.add( cd );
		}
		return new ResultMetaData( columnMeta );
	}
	/**
	 * @param dataSetName
	 * @return
	 * @throws BirtException
	 */
	private IResultMetaData getRealMetaData( DataSetHandle dataSetHandle )
			throws BirtException
	{
		QueryDefinition query = new QueryDefinition( );
		query.setDataSetName( dataSetHandle.getQualifiedName( ) );
		query.setMaxRows( 1 );
		
		boolean useResultHints = dataSetHandle instanceof ScriptDataSetHandle;