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the cheapest-total inner path as a new candidate while truncating the sort key list, if it already matched the full sort key list. This is too much of a corner case to be worth back-patching, since it's unusual for the cheapest total path to be sorted, and anyway no real harm is done (except in JOIN_SEMI/ANTI cases where cost_mergejoin is a bit broken at the moment). But it wasn't behaving as intended, so fix it. Noted while examining a test case from Kevin Grittner. This error doesn't explain his issue, but it does explain why "set enable_seqscan = off" seemed to reproduce it for me. |
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