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
for ( int i = 0; it.hasNext( ); i++ )
				{
					ISortDefinition src = (ISortDefinition) it.next( );
					int sortIndex = -1;
					String sortKey = src.getColumn( );
					if ( sortKey == null )
						sortKey = src.getExpression( ).getText( );
					else
					{
						sortKey = getColumnRefExpression( sortKey );
					}
					temporaryComputedColumns.add( new ComputedColumn( "_{$TEMP_SORT_"
							+ i + "$}_",
							sortKey,
							DataType.ANY_TYPE ) );
					sortIndex = -1;
					sortKey = String.valueOf( "_{$TEMP_SORT_" + i + "$}_" );
					IQuery.SortSpec dest = new IQuery.SortSpec( sortIndex,
							sortKey,
							src.getSortDirection( ) == ISortDefinition.SORT_ASC );
					sortSpecs[i] = dest;
				}
				odiQuery.setOrdering( Arrays.asList( sortSpecs ) );
			}
			
			List dataSetFilters = new ArrayList( );
			List queryFilters = new ArrayList( );
			if ( dataSet.getFilters( ) != null )
			{
				dataSetFilters = dataSet.getFilters( );