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When systable_beginscan() and systable_beginscan_ordered() choose an index scan, they remap the attribute numbers in the passed-in scan keys to the attribute numbers of the index, and then write those remapped attribute numbers back into the scan key passed by the caller. This second part is surprising and gratuitous. It means that a scan key cannot safely be used more than once (but it might sometimes work, depending on circumstances). Also, there is no value in providing these remapped attribute numbers back to the caller, since they can't do anything with that. Fix that by making a copy of the scan keys passed by the caller and make the modifications there. Also, some code that had to work around the previous situation is simplified. Discussion: https://www.postgresql.org/message-id/flat/f8c739d9-f48d-4187-b214-df3391ba41ab@eisentraut.org |
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