tables.sql contains the following senctence:
- Formerly this index didn't cover cl_type (since that didn't exist), so old
- callers won't be using an index: fix this?
CREATE INDEX /*i*/cl_sortkey ON /*_*/categorylinks (cl_to,cl_type,cl_sortkey,cl_from);
Please evaluate the timeframe this index was without cl_from and write a update step to the Updater. If the timeframe is short, you can set this to WONTFIX and skip the update step. Thanks.