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
outerResults = ( (IQueryService) outerRts );
			if ( outerResults.isClosed( ) )
			{
				
				throw new DataException( ResourceConstants.RESULT_CLOSED );
			}
			this.nestedLevel = outerResults.getNestedLevel( );
			this.setParentExecutorHelper( outerResults.getExecutorHelper( ) );
		}
		
		
		
		dataSet = newDataSetRuntime( );
		assert dataSet != null;
		openDataSource( );
		
		dataSet.beforeOpen( );
		IExpressionProcessor exprProcessor = new ExpressionProcessor( null,
				null,
				dataSet,
				null );
		
		
		odiQuery = createOdiQuery( );
		odiQuery.setDistinctValueFlag( dataSet.needDistinctValue( ) );
		odiQuery.setExprProcessor( exprProcessor );
		populateOdiQuery( );
		prepareOdiQuery( );
		isPrepared = true;
	}