The click sort behavior of Flag link field is not working in views.
It fires the following error:
SQLSTATE[42S22]: Column not found: 1054 Unknown column 'unknown' in 'order clause
Fix the Flag link field views handler so that it sends query against a real table column to make click sorting possible.
Needs work
4.0
Views integration
The patch will have to be re-rolled with new suggestions/changes described in the comments in the issue.
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