Bug 141950 Selection of select value in data set filter is error
Details: Selection of select value in data set filter is error Step: 1.New a report design. 2.Create a sample datasource and dataset. 3.Switch to filter. 4.Select a value in expression. 5.Drop the list of the value1 and select <select value...> Actual result: No value is appear and pop up an error. It said that "An expression has not been set"
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/data/ui/util/DataSetProvider.java
.adaptDataSet( dataSet );
		if ( !useColumnHints )
		{
			dataSetDesign.getResultSetHints( ).clear( );
		}
		if ( !useFilters )
		{
			dataSetDesign.getFilters( ).clear( );
		}
		IQueryResults resultSet = executeQuery( session, queryDefn );
		IResultMetaData metaData = resultSet.getResultMetaData( );
		
		int columnCount = 0;
		if ( metaData != null )
			columnCount = metaData.getColumnCount( );
		if ( dataSet.getPropertyHandle( DataSetHandle.RESULT_SET_PROP )
				.iterator( )
				.hasNext( ) )
		{
			for ( int n = 0; n < columnCount; n++ )
			{
				String columnLabel = metaData.getColumnLabel( n + 1 );
				String columnName = metaData.getColumnName( n + 1 );
				if ( !columnLabel.equals( columnName )
						&& columnName.lastIndexOf( RENAME_SEPARATOR ) >= 0
						&& !columnLabel.equals( columnName.substring( 0,
								columnName.lastIndexOf( RENAME_SEPARATOR ) ) ) )
				{
					dataSet.getPropertyHandle( DataSetHandle.RESULT_SET_PROP )
							.clearValue( );