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Fix use of wrong index in ComputeXidHorizons().
This bug, recently introduced in941697c, at least lead to vacuumfailing because it found tuples inserted by a running transaction, butbelow the freeze limit. The freeze limit in turn is directly affectedby the aforementioned bug.Thanks to Tom Lane figuring how to make the bug reproducible.We should add a few more assertions to make sure this type of bugisn't as hard to notice, but it's not yet clear how to best do so.Co-Diagnosed-By: Tom Lane <tgl@sss.pgh.pa.us>Author: Andres Freund <andres@anarazel.de>Discussion:https://postgr.es/m/1013484.1597609043@sss.pgh.pa.us1 parent49967da commitf6661d3
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