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The essence of this test is: for $a in (3, 2, 1), $b in (6, 5, 4) order by $b return $a and the expexted result is: 3 2 1 3 2 1 3 2 1 However, there is no order by specified for $a, and so (for example) "3 2 1 1 2 3 3 2 1" is also a valid result. The test should probably read "stable order by $b", or alternatively all 216 valid results could be listed in the catalog.
XMark-Q19 (and hence XMark-All) also suffer from the problem of a non-stable sort being applied with multiple sets of acceptable results.
A fix has been attempted in CVS, XQTS_current.zip is updated. If the resolution is satisfactory, feel free to change status to closed. Otherwise reopen this report. If no feedback is given within two weeks, status will be set to closed.