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The expected result of windowing query Q4 is wrong. Instead of 8 9 17 18 it should be 8 9 17.333333333333332 18.666666666666668
I believe that the result is correct, but the source document does not reflect an earlier change. See Bug #11763.
I agree with comment #1 and, hence, mark the bug as resolved (duplicated of #11763). *** This bug has been marked as a duplicate of bug 11763 ***