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From: Rahman Duran <[email protected]>
To: Tom Lane <[email protected]>
Cc: [email protected]
Subject: Re: PostgreSQL 18.1 non deterministic collation "LIKE %abc%" performance
Date: Tue, 30 Dec 2025 10:07:22 +0300
Message-ID: <CA+jeBreFqkGc9f=_cBcMWkw_E5tTU_Rw4FQi6ehCDrTR17anUw@mail.gmail.com> (raw)
In-Reply-To: <[email protected]>
References: <CA+jeBrejfchM60epUo1J3M8mMAQOcCWotpDP9QZYgEL=j0b=pg@mail.gmail.com>
	<[email protected]>

Tom Lane <[email protected]>, 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

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