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"SELECT pg_import_system_collations(0)" caused an assertion failure. With a random nonzero argument --- or indeed with zero, in non-assert builds --- it would happily make pg_collation entries with garbage values of collnamespace. These are harmless as far as I can tell (unless maybe the OID happens to become used for a schema, later on?). In any case this isn't a security issue, since the function is superuser-only. But it seems like a gotcha for unwary DBAs, so let's add a check that the given OID belongs to some schema. Back-patch to v10 where this function was introduced. |
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