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
Set set = map1.keySet( );
		Iterator it = set.iterator( );
		while ( it.hasNext( ) )
		{
			Object ob = it.next( );
			Object value1 = map1.get( ob );
			Object value2 = map1.get( ob );
			if ( isEqualObject( value1, value2 ) == false )
				return false;
		}
		return true;
	}
	/**
	 * @param col1
	 * @param col2
	 * @return
	 */
	private int isEqualBasicCol( Collection col1, Collection col2 )
	{
		if ( col1 == col2 )
		{
			return B_TRUE;
		}
		else if ( col1 == null || col2 == null )
		{
			if ( col1 == null )
			{
				if ( col2.size( ) == 0 )
					return B_TRUE;
				else