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The executor checks for this error, and so does the bootstrap catalog loader, but we never checked for it in retail catalog manipulations. The folly of that has now been exposed, so let's add assertions checking it. Checking in CatalogTupleInsert[WithInfo] and CatalogTupleUpdate[WithInfo] should be enough to cover this. Back-patch to v10; the aforesaid functions didn't exist before that, and it didn't seem worth adapting the patch to the oldest branches. But given the risk of JIT crashes, I think we certainly need this as far back as v11. Pre-v13, we have to explicitly exclude pg_subscription.subslotname and pg_subscription_rel.srsublsn from the checks, since they are mismarked. (Even if we change our mind about applying BKI_FORCE_NULL in the branch tips, it doesn't seem wise to have assertions that would fire in existing databases.) Discussion: https://postgr.es/m/298837.1595196283@sss.pgh.pa.us
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