Bug 213973 [2.2.2]ClassCastException throws out when preview a table share crosstab
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/data/dte/ReportQueryBuilder.java
return null;
				}
			}
			else
			{
				query = createQuery( row, value );
			}
			for ( int i = 0; i < row.getCellCount( ); i++ )
			{
				CellDesign cell = row.getCell( i );
				build( query, cell );
			}
			try
			{
				transformExpressions( row, query );
			}
			catch ( BirtException ex )
			{
				context.addException( row.getHandle( ), ex );
			}
			return getResultQuery( query, value );
		}
		/**
		 * handles a cell in a row
		 */
		public Object visitCell( CellDesign cell, Object value )
		{
			BaseQueryDefinition query;
			if ( cell.useCachedResult( ) )
			{