Fix GROUP BY error if sql_mode "ONLY_FULL_GROUP_BY" is used [2.x] #295
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What does it do?
Changes the SQL query to only include the columns the result is grouped by (plus the 'id' column).
Why is it needed?
If the SQL-mode "ONLY_FULL_GROUP_BY" is used, the current code throws an error.
Related issue(s)/PR(s)
Resolves #293 for the 2.x branch.
Undoes the change from #281 (as I don't think it fixed the issue successfully).