61a26671c6
Per comment from Greg Stark, it's less clear that HOT chains don't conflict with the index than it would be for a valid index. So, let's preserve the former behavior that indcheckxmin does get set when there are potentially-broken HOT chains in this case. This change does not cause any pg_index update that wouldn't have happened anyway, so we're not re-introducing the previous bug with pg_index updates, and surely the case is not significant from a performance standpoint; so let's be as conservative as possible.
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