Op 16-08-2022 om 12:36 schreef Daniel Gustafsson:
On 16 Aug 2022, at 12:17, PG Doc comments form <nore...@postgresql.org> wrote:

I have a question regarding the trigram algorithm and I can not find any
information about it in your documentation:

Maybe we should add something about this?

Yeah, it's a bit strange that none of the following strings yield any info on that page: 'case', 'sensitiv', 'upper', 'lower', and that there is no mention of the ~ versus ~* difference.

Maybe worth to (already in pgtrgm.html) give the simple hint:
  ~  is case-sensitive
  ~* is case-insensitive


In any case a link to  functions-matching.html  seems indicated.


Erik Rijkers



Do you distinguish between lower and uppercase? Or do you consider all words
in lowercase?

There is support for compiling pg_trgm case sensitive, but it's by default case
insensitive.

# SELECT word_similarity('word', 'WORD');
  word_similarity
-----------------
                1
(1 row)

Happy to get a short feedback from you,

I would recommend the pg_general mailinglist as that will be a safer way to get
general questions answered.

--
Daniel Gustafsson               https://vmware.com/





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