Github user srowen commented on the issue: https://github.com/apache/spark/pull/16331 I don't think this can be the right change -- it's construing any date before 2000 as invalid, which may happen to be OK but is pretty arbitrary. It arises as the result of formatting -1 as a date, and this method seems to try to handle that, but it's comparing the string to -1 I guess. Surely this should be handled elsewhere, like in whatever calls `formatDate`?
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