6d1e361852
get rid of the OID column. This eliminates the problem discovered by Heikki back in November that 8.4's suppression of "unnecessary" junk filtering in INSERT/SELECT could lead to an Assert failure, or storing of oids into a table that shouldn't have them if Asserts are off. While that particular problem could have been solved in other ways, it seems likely to be just a forerunner of things to come if we continue to allow tables to contain rows that disagree with the pg_class.relhasoids setting. It's better to make this operation slow than to sacrifice performance or risk bugs in more common code paths. Also, add ALTER TABLE SET WITH OIDS to rewrite the table to add oids. This was a bit more controversial, but in view of the very small amount of extra code needed given the current ALTER TABLE infrastructure, it seems best to eliminate the asymmetry in features.
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