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 se
	 * @param se2
	 * @return
	 */
	private boolean isEqualExpression2( IScriptExpression se,
			IScriptExpression se2 )
	{
		if ( se == se2 )
			return true;
		else if ( se == null || se2 == null )
			return false;
		return se.getDataType( ) == se2.getDataType( )
				&& isEqualString( se.getText( ), se2.getText( ) );
	}
	/**
	 * compare data source design
	 * @param dataSourceDesign
	 * @param dataSourceDesign2
	 * @return
	 */
	private boolean isEqualDataSourceDesign(
			IBaseDataSourceDesign dataSourceDesign,
			IBaseDataSourceDesign dataSourceDesign2 )
	{
		if ( dataSourceDesign == dataSourceDesign2 )
			return true;
		if ( dataSourceDesign == null || dataSourceDesign2 == null )
			return false;