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From: Jeff Janes <[email protected]>
To: [email protected]
Subject: Add <caution> for ALTER TEXT SEARCH CONFIGURATION
Date: Fri, 15 Nov 2019 14:09:59 -0500
Message-ID: <CAMkU=1wQ-t=7gVoWRv6+yik+yZ20dEEwGjCXumNpHEFKLtxfVg@mail.gmail.com> (raw)

If you alter one of the built-in text search configurations, the
modifications to it will not get dumped by pg_dump, and thus won't get
propagated by pg_upgrade leading to silent behavior changes in the new
cluster (as well in any other type of restoration from pg_dump output)

I would say it is bad practise to alter one of those anyway, rather than
copy and alter the copy.  But I wasn't aware until now of just how bad of
an idea it was.  I think that this needs to be warned about in the docs
for ALTER TEXT SEARCH CONFIGURATION.  If I were monkeying around in
$SHAREDLIB/tsearch_data, I'd expect traps like this, but not when executing
things from SQL after reading the docs on the command.

Cheers,

Jeff

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