Definitive answer: can functions use indexes?

hi,

I've been using Postgres for years ( :heart: ) and I'm still in doubt
about this. Would somebody provide an authoritative, definitive,
narrative answer?

-> Can a function like `LEFT()` use an index?

(Or do I have to find an "equivalent" operator in order to leverage
indexes?)

Thanks!
Seamus

--
Seamus Abshere, SCEA
+598 99 54 99 54
https://github.com/seamusabshere