Re: PostgreSQL 18.1 non deterministic collation "LIKE %abc%" performance

Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, 30 Ara 2025 Sal, 09:51 tarihinde şunu yazdı:
>The fundamental problem here is not wanting to make assumptions about
>which character strings a non-deterministic collation will consider
>equal to which other character strings. If you have concrete ideas
>about how to improve that, let's hear them.

Thanks for the explanations. I am just a user, not a DB developer :) So no
ideas I am afraid. I was just surprised that running the lower() function
on every column of every row is way faster than using nondeterministic
collation. I will test GIN index with trigram to see if it helps. If not I
will leave the code as is with lower() functions.

Regards,
Rahman Duran