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
{
				OnFetchScriptHelper event = new OnFetchScriptHelper( dataSet );
				odiQuery.addOnFetchEvent( event );
			}
			if ( dataSetFilters.size( )
					+ queryFilters.size( ) + multipassFilters.size( ) > 0 )
			{
				IResultObjectEvent objectEvent = new FilterByRow( dataSetFilters,
						queryFilters,
						multipassFilters,
						dataSet );
				odiQuery.addOnFetchEvent( objectEvent );
			}
			
			odiQuery.setMaxRows( this.baseQueryDefn.getMaxRows( ) );
		}
		finally
		{
			Context.exit( );
		}
	}
	/**
	 * 
	 * @param cx
	 * @throws DataException
	 */
	private void populateGrouping( Context cx ) throws DataException
	{
		List groups = this.baseQueryDefn.getGroups( );
		if ( groups != null && !groups.isEmpty( ) )