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b53800355f
This command generated new pg_depend entries linking the index to the constraint and the constraint to the table, which match the entries made when a unique or primary key constraint is built de novo. However, it did not bother to get rid of the entries linking the index directly to the table. We had considered the issue when the ADD CONSTRAINT USING INDEX patch was written, and concluded that we didn't need to get rid of the extra entries. But this is wrong: ALTER COLUMN TYPE wasn't expecting such redundant dependencies to exist, as reported by Hubert Depesz Lubaczewski. On reflection it seems rather likely to break other things as well, since there are many bits of code that crawl pg_depend for one purpose or another, and most of them are pretty naive about what relationships they're expecting to find. Fortunately it's not that hard to get rid of the extra dependency entries, so let's do that. Back-patch to 9.1, where ALTER TABLE ADD CONSTRAINT USING INDEX was added. |
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