This patch got mostly ignored since 2019-07 commitfest :-( The latest patch (sent by Nikita) does not apply because of a minor conflict in contrib/ltree/ltxtquery_io.c.
I see the patch removes a small bit of ltree_plpython tests which would otherwise fail (with the "I don't know plpython" justification). Why not to instead update the tests to accept the new output? Or is it really the case that the case that we no longer need those tests?
The patch also reworks some parts from "if" to "switch" statements. I agree switch statements are more readable, but maybe we should do this in two steps - first adopting the "switch" without changing the logic, and then making changes. But maybe that's an overkill.
regards
-- Tomas Vondra http://www.2ndQuadrant.com PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services