Bug 118780 Set alias for columns in data set but in expression builder still shows the old columns name when select the dataset.
Description: Set alias for columns in data set but in expression builder still shows the old columns name when select the dataset. Steps to reproduce: 1. New a datasource and a dataset 2. Set alias of the first column in the dataset to "column1". 3. Insert a data item and bind it to dataset. 4. In the expression builder, select the dataset and double click the first column name. Expected result: According to scr #78193 in tracker, the first column in expression build should use alias name instead of original name. Actual result: The original name of the first column was listed in the below of expression builder but the alias name appeared above as row["column1"] after double click the original name.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ExpressionProvider.java
* (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.designer.ui.dialogs.IExpressionProvider#getCategory()
	 */
	public Object[] getCategory( )
	{
		ArrayList categoryList = new ArrayList( 5 );
		if ( dataSetList != null && !dataSetList.isEmpty( ) )
		{
			categoryList.add( DATASETS );
		}
		if ( moduleHandle.getParameters( ).getCount( ) != 0 )
		{
			categoryList.add( PARAMETERS );
		}
		categoryList.add( NATIVE_OBJECTS );
		categoryList.add( BIRT_OBJECTS );
		categoryList.add( OPERATORS );
		Object[] category = categoryList.toArray( );
		if ( filterList != null && !filterList.isEmpty( ) )
		{
			for ( Iterator iter = filterList.iterator( ); iter.hasNext( ); )
			{
				Object obj = iter.next( );
				if ( obj instanceof ExpressionFilter )
				{
					category = ( (ExpressionFilter) obj ).filter( null,
							category );
				}
			}