Bug 189100 [Regression]X-axis data column issue[0001]
Description: [Regression]X-axis data column issue[0001] Step: 1.New a sample datasource and dataset from OFFICES 2.New a chart and use the dataset 3.Change the data type of OFFICECODE from string to integer. 4.Drop the column of OFFICECODE to Value(Y)Series. Actual result: Show the error message: Unable to use a text data to render a numerical/datetime axis.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/executor/transform/pass/PassManager.java
* @throws DataException
	 */
	private void populateAggregationInBinding( ) throws DataException
	{
		this.populator.getExpressionProcessor( )
				.setResultIterator( this.populator.getResultIterator( ) );
		this.populator.getResultIterator( ).clearAggrValueHolder( );
		List aggrDefns = this.populator.getEventHandler( ).getAggrDefinitions( );
		AggrDefnRoundManager factory = new AggrDefnRoundManager( aggrDefns );
		for ( int i = 0; i < factory.getRound( ); i++ )
		{
			AggregationHelper helper = new AggregationHelper( factory.getAggrDefnManager( i ),
					this.populator );
			this.populator.getResultIterator( ).addAggrValueHolder( helper );
		}
	}
	/**
	 * 
	 *
	 */
	private void prepareFetchEventList( )
	{
		Object[] fetchEventsList = getFetchEventListFromQuery( this.populator );
		for ( int i = 0; i < fetchEventsList.length; i++ )
		{
			if ( fetchEventsList[i] instanceof ComputedColumnHelper )
			{
				computedColumnHelper = (ComputedColumnHelper) fetchEventsList[i];
			}
			else if ( fetchEventsList[i] instanceof FilterByRow )