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From: Henson Choi <[email protected]>
To: Heikki Linnakangas <[email protected]>
Cc: Thomas Munro <[email protected]>
Cc: Robert Haas <[email protected]>
Cc: Tom Lane <[email protected]>
Cc: Jeroen Vermeulen <[email protected]>
Cc: VASUKI M <[email protected]>
Cc: [email protected]
Subject: Re: BUG #19354: JOHAB rejects valid byte sequences
Date: Tue, 14 Apr 2026 19:47:07 +0900
Message-ID: <CAAAe_zDXqSiqv3G5se7RFiN-AvLQ=zrHfxYuRWFgoJn5+t9fRg@mail.gmail.com> (raw)
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	<[email protected]>

Hi all,

I'd like to ask for a brief hold on the removal before the patch
is committed.

JOHAB is formally specified in KS C 5601-1992 Annex 3 (later
renumbered KS X 1001:1992), a Korean national standard published
by the Korean Agency for Technology and Standards (KATS). This
document is written in Korean, and I believe a native Korean
speaker reviewing the original standard directly is the most
reliable way to verify the correct byte ranges and resolve the
ambiguity that has been mentioned in this thread.

I am currently looking into the original standard document and
will follow up with a precise specification and a fix patch
shortly.

One point worth considering before removal: JOHAB may be obsolete
for new systems, but legacy Korean data from the 1990s does exist
in old archives, government records, and university systems. As a
client encoding, JOHAB support in PostgreSQL provides a useful
migration path for loading such data. Removing it closes that door
permanently with no way back.

I am Korean, and I would like to take responsibility for verifying
the standard and submitting a proper fix.

Regards,
Henson

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