Bug 192083 [regression]DataException when preview attached xtab report.[1102]
data/org.eclipse.birt.report.data.adapter/src/org/eclipse/birt/report/data/adapter/impl/DataRequestSessionImpl.java
return new DataSetMetaDataHelper( this.dataEngine,
				this.modelAdaptor,
				this.sessionContext ).getDataSetMetaData( dataSetHandle,
				useCache );
	}
	/*
	 * @see org.eclipse.birt.report.data.adapter.api.DataRequestSession#getColumnValueSet(org.eclipse.birt.report.model.api.DataSetHandle,
	 *      java.util.Iterator, java.util.Iterator, java.lang.String)
	 */
	public Collection getColumnValueSet( DataSetHandle dataSet,
			Iterator inputParamBindings, Iterator columnBindings,
			String boundColumnName ) throws BirtException
	{
		return getColumnValueSet( dataSet,
				inputParamBindings,
				columnBindings,
				boundColumnName,
				null );
	}
	
	/*
	 * (non-Javadoc)
	 * @see org.eclipse.birt.report.data.adapter.api.DataRequestSession#getColumnValueSet(org.eclipse.birt.report.model.api.DataSetHandle, java.util.Iterator, java.util.Iterator, java.lang.String, int, int)
	 */
	public Collection getColumnValueSet( DataSetHandle dataSet,
			Iterator inputParamBindings, Iterator columnBindings,
			String boundColumnName, IRequestInfo requestInfo )
			throws BirtException
	{
		ArrayList temp = new ArrayList();