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
*            the handle of the module
	 * @param dataSetList
	 *            the list of the data set
	 */
	public ExpressionProvider( )
	{
		this( SessionHandleAdapter.getInstance( ).getReportDesignHandle( ) );
	}
	/**
	 * Create a new expression provider with the current module and the given
	 * dataset list
	 * 
	 * @param dataSetList
	 *            the list of the data set
	 */
	public ExpressionProvider( List dataSetList )
	{
		this( SessionHandleAdapter.getInstance( ).getReportDesignHandle( ),
				dataSetList );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.designer.ui.dialogs.IExpressionProvider#getOperators()
	 */
	public String[] getOperators( )
	{
		return OPERATORS_ON_BAR;
	}
	/*