Many Drupal users found out that while using Drupal Views that the Is not one of" filter operator was broken. It seemed to be returning the same results as the "Is not empty (NOT NULL)" operation. The error commonly occurred in the text list fields and boolean fields. If you are encountering the same situation in your Drupal site then read on to find out more.
Here are some of the workarounds which many users have tried out with mixed success.
- You can obtain the same output by using the "Value is one of (A,C,D) OR "Value is empty" as a filter combination block.
- Some users have reported success with the following untested patch. http://drupal.org/files/views-1529016-not-in-include-null-values.patch
Hope that helps.
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