Jakub Horčička
Jakub Horčička
I've just found out that this functionality is already present in EqualsFilter.
A workaround is to type the directory name ".datacleaner" into "File name" field and click "Open". 
OK, let's wait for the right time to do it. Thanks for your comments, guys.
  
I am not going to post the whole debug output but the problem is indeed in the final SQL query which ends with: ``` ... FROM WHERE IS NOT NULL...