On Wed, Apr 09, 2025 at 10:50:00PM +0200, Laurenz Albe wrote: > The IMMUTABLE function cannot be inlined because to_char() is not IMMUTABLE. Q: Why would to_char() not be IMMUTABLE? A: Because it makes use of locales, and I guess the guc-timezone GUC, which could change if the expression is ultimately used in a PlPgSQL fragment, or if it's in a prepared statement. (I think.) That to_char is not immutable is not documented though. Though it's clear when looking at the docs for the `jsonb_.*_tz()` functions. Nico --
