Bug 122854 There is redundant columns in "available columns" list in "export data" dialog.
Description: There is redundant columns in "available columns" list in "export data" dialog. Steps to reproduce: 1. Preview attached design in web viewer. 2. Select the table and click on "export" button. 3. There is a "detail" column name in "available columns" list which is not data set column.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/ir/Report.java
{
	/**
	 * the non-inheritable style of the report body
	 */
	protected StyleDeclaration defaultStyle;
	/**
	 * the name of Report root style
	 */
	protected String rootStyleName;
	/**
	 * A collection that stores all the report parameters.
	 */
	protected ArrayList allParameters = null;
	/**
	 * report design get from Model
	 */
	protected ReportDesignHandle reportDesign;
	/**
	 * default unit
	 */
	protected String unit;
	/**
	 * styles used in this report
	 */
	protected ArrayList styles = new ArrayList( );
	/**
	 * style-name mapping table
	 */
	protected HashMap styleTable = new HashMap( );