Bug 142939 Invalid interval will cause incorrect group action.
Description: Invalid interval will cause incorrect group action. Steps to reproduce: 1. Insert a list 2. Add a group, key is string type column, set interval to year, range to 3 3. Preview Expected result: Error msg about invald interval and ignore the invalid interval. Actual result: No error msg and only return one group with all datarows.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/QueryExecutor.java
/**
	 * Open the required DataSource. This method should be called after
	 * "dataSource" is initialized by findDataSource() method.
	 * 
	 * @throws DataException
	 */
	protected void openDataSource( ) throws DataException
	{
		assert odiDataSource == null;
		
		
		if ( dataSource != null )
		{
			
			if ( !dataSource.isOpen( )
					|| DataSetCacheManager.getInstance( ).doesLoadFromCache( ) == true )
			{
				
				
				
				dataSource.beforeOpen( );
				
				odiDataSource = createOdiDataSource( );
				 
				
				odiDataSource.setAppContext( queryAppContext );
				
				dataSource.openOdiDataSource( odiDataSource );
				dataSource.afterOpen( );
			}