Right now, if skip stop words and stemming are enabled, SASI will put stemming in the filter pipeline BEFORE skip_stop_words:
The problem is that stemming before removing stop words can yield wrong results.
I have an example:
Because of stemming danse ( dance in English) becomes dans (the final vowel is removed). Then skip stop words is applied. Unfortunately dans (in in English) is a stop word in French so it is removed completely.
In the end the query is equivalent to SELECT * FROM music.albums WHERE country='France' and of course the results are wrong.
Attached is a trivial patch to move the skip_stop_words filter BEFORE stemming filter