Add formats that store indexes to the DatabaseJoiner transformer - like MapInfo TAB, ESRI SHP file, etc. that includes indexing on the writer.
My use case is looking in tile grids,.. rather than having to convert to a database format to use the Joiner, or having to read all the data using a FeatureMerger, I would like to be able to be to read features based on a where clause directly from the file (or on the FeatureReader), so using the Joiner (or a where clause on the reader if it was possible) I could do that
