Thread: pgsql: Explain dropdb can't use syscache because of TOAST

Explain dropdb can't use syscache because of TOAST

Add a comment explaining dropdb() can't rely on syscache. The issue with
flattened rows was fixed by commit 0f92b230f88b, but better to have
a clear explanation why the systable scan is necessary. The other places
doing in-place updates on pg_database have the same comment.

Suggestion and patch by Yugo Nagata. Backpatch to 12, same as the fix.

Author: Yugo Nagata
Backpatch-through: 12
Discussion: https://postgr.es/m/CAJTYsWWNkCt+-UnMhg=BiCD3Mh8c2JdHLofPxsW3m2dkDFw8RA@mail.gmail.com

Branch
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REL_13_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/4e7531fda587c35a4ee0fa2e5fdf90b0914a1685

Modified Files
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src/backend/commands/dbcommands.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)