Edit a report. In the report's data properties, set a filter on some_column "NOT NULL", e.g. through the graphical interface. The generated SQL condition snippet is correct, and shows: (some_column IS NOT NULL). Click the "..." next to the filter to edit the filter through the graphical interface. It shows some_column NULL, instead of "NOT NULL". If one presses OK, the generated SQL condition snippet becomes: (some_column IS NULL). Expected behaviour: filter stays the same, i.e. "some_column IS NOT NULL".
[This is an automated message.] This bug was filed before the changes to Bugzilla on 2011-10-16. Thus it started right out as NEW without ever being explicitly confirmed. The bug is changed to state NEEDINFO for this reason. To move this bug from NEEDINFO back to NEW please check if the bug still persists with the 3.5.0 beta1 or beta2 prereleases. Details on how to test the 3.5.0 beta1 can be found at: http://wiki.documentfoundation.org/QA/BugHunting_Session_3.5.0.-1 more detail on this bulk operation: http://nabble.documentfoundation.org/RFC-Operation-Spamzilla-tp3607474p3607474.html
Cannot reproduce on branch features/base-preview, which means it is fixed in 3.5.6, or maybe only 3.6.0. My guess is that is fixed far earlier, though.
*** Bug 55703 has been marked as a duplicate of this bug. ***