Re: Functions used by index don't need to be immutable?

hubert depesz lubaczewski <depesz@depesz.com>

From: hubert depesz lubaczewski <depesz@depesz.com>

To: Heikki Linnakangas <hlinnaka@iki.fi>

Cc: PostgreSQL mailing lists <pgsql-bugs@lists.postgresql.org>

Date: 2025-11-11T12:43:53Z

Lists: pgsql-bugs

On Tue, Nov 11, 2025 at 02:43:18PM +0200, Heikki Linnakangas wrote:
> In case of SQL functions, the immutability check can inline or "see through"
> the definition and determine that the expression used in the function
> doesn't contain any immutable expressions. If you modify get_tsvector,
> adding a random() to it for example, then you will get the error.

Ah, makes sense. Thanks a lot.

Best regards,

depesz