Hi, having an issue with Tsearch2 and how stop words lexemes are sometimes being utilized and sometimes not. I would expect the behavior for to_tsquery for the three variations of "what", "what's" and "whats" to be consistent (using 'en_stem') and for all variations to be ignored since they all result in a stop word of "what". However, this is not the case as to_tsquery("whats") returns the stop word "what" as a result. Even more confusing is that if one were to look at the lexize results below, they are inconsistent with the to_tsquery results below. This seems like a bug to me.
goodrec_2=# select lexize('en_stem', 'what''s');
lexize
--------
{what}
goodrec_2=# select lexize('en_stem', 'whats');
lexize
--------
{what}
goodrec_2=# select lexize('en_stem', 'what');
lexize
--------
{}
goodrec_2=# select to_tsquery('what''s');
NOTICE: query contains only stopword(s) or doesn't contain lexeme(s), ignored
to_tsquery
goodrec_2=# select to_tsquery('whats');
to_tsquery
------------
'what'
goodrec_2=# select to_tsquery('what');
NOTICE: query contains only stopword(s) or doesn't contain lexeme(s), ignored