Commit 55f30e6

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Postpone calls of unsafe server-side functions in pg_dump.

Avoid calling pg_get_partkeydef(), pg_get_expr(relpartbound), and regtypeout until we have lock on the relevant tables. The existing coding is at serious risk of failure if there are any concurrent DROP TABLE commands going on --- including drops of other sessions' temp tables. Back-patch of commit e3fcbbd. That's been in v15/HEAD long enough to have some confidence about it, so now let's fix the problem in older branches. Original patch by me; thanks to Gilles Darold for back-patching legwork. Discussion: https://postgr.es/m/2273648.1634764485@sss.pgh.pa.us Discussion: https://postgr.es/m/7d7eb6128f40401d81b3b7a898b6b4de@W2012-02.nidsa.loc Discussion: https://postgr.es/m/45c93d57-9973-248e-d2df-e02ca9af48d4@darold.net

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