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
return B_FALSE;
			}
			else
			{
				if ( col1.size( ) == 0 )
					return B_TRUE;
				else
					return B_FALSE;
			}
		}
		else
		{
			if ( col1.size( ) == col2.size( ) )
				return B_UNKNOWN;
			else
				return B_FALSE;
		}
	}
	/**
	 * Filter does not affect the raw data and metadata
	 * @param filter1
	 * @param filter2
	 * @return
	 */
	private boolean isEqualFilters( List filter1, List filter2 )
	{
		return true;
	}
	/**
	 *