Bug 206279 Removed computed cols listed in expression builder[07]
Description: Removed computed column listed in expression builder inside DataSet Editor dialog Build number:2.2.2.v20071011 Steps to reproduce: 1. New data source and dataset. 2. Add a computed column in dataset and click OK. 3. Open the dataset, remove the computed column. 4. Add a new computed column and check columns in available Data Sets. Expected result: The removed computed column isn't there. Actual result: The removed computed column is still there for selection. Error log:n/a
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/data/ui/util/DataSetProvider.java
* useColumnHints, useFilters information.
	 * 
	 * @param dataSet
	 *            Given DataSet providing SQL query and parameters.
	 * @param bindingParams
	 *            Given Parameter bindings providing binded parameters, null if
	 *            no binded parameters.
	 * @param useColumnHints
	 *            Using column hints flag.
	 * @param useFilters
	 *            Using filters flag.
	 * @return IPreparedQeury
	 * @throws BirtException
	 */
	public final IPreparedQuery prepareQuery( DataSetHandle dataSet,
			ParamBindingHandle[] bindingParams, boolean useColumnHints,
			boolean useFilters ) throws BirtException
	{
		DataRequestSession session = getDataRequestSession( dataSet );
		IBaseDataSetDesign dataSetDesign = getDataSetDesign( dataSet,
				useColumnHints,
				useFilters );
		return session.prepare( getQueryDefinition( dataSetDesign,
				bindingParams ), null );
	}
	/**
	 * @param parent
	 * @return
	 */
	public static ClassLoader getCustomScriptClassLoader( ClassLoader parent )