Bug 140705 Insert group does not work properly when cache preference is set
When cache preference is set, insert group does not work properly. Steps to reproduce problem: In Birt report designer: New a report design, data source, data set; Insert a table, drag several columns into table; Set cache preference for data set: check checkbox "Cache dataset data for report view"; Select "Cache and use first [] rows"; Enter '100' as row count. PREVIEW report; Insert group, Preview report again ---> problem happens: only header line will show up. All details are missing. Sample report is also attached.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/executor/DataSourceAndDataSet.java
* @param map2
	 * @return
	 */
	private boolean isEqualProps( Map map1, Map map2 )
	{
		if ( map1 == map2 )
		{
			return true;
		}
		else if ( map1 == null || map2 == null )
		{
			if ( map1 == null )
			{
				if ( map2.size( ) != 0 )
					return false;
				else
					return true;
			}
			else
			{
				if ( map1.size( ) != 0 )
					return false;
				else
					return true;
			}
		}
		else if ( map1.keySet( ).size( ) != map2.keySet( ).size( ) )
		{
			return false;
		}