write your own dictionary, which implements any logic you need. In your
case it's just a wrapper around ispell, which will returns original string
not stem. See example
http://www.sai.msu.su/~megera/postgres/fts/doc/fts-intdict-xmp.html
and russian article
http://www.sai.msu.su/~megera/postgres/talks/fts_pgsql_intro.html#ftsdict
Ah, I understand you!
You offer to write a small Postgres contrib module (new dictionary) in C and implement all logic in it.
Seems it's a bit complex solution for such a simple task (exclude surnames for lexization), but - it could be implemented, of course.
> Of course I can create all word-forms of all Russian names using ispell and
> then - subtract this full list from Ispell dictionary (so I will remove
> "Ivan", "Ivanami" etc. from it). But possily tsearch2 has this subtraction
> algorythm already.
>
don't do that ! Just go plain way.
Another method is to generate a singular
synonym dictionary based on all Russian names word-forms using ispell (we will get all suspicous surnames in this set) and add it before ispell. This solution does not need to write anything in C.