Summary:
Orderby doesn't work with mysql 5.7+
Detailed Description:
It's impossibile to use orderby="custom_field" with mysql 5.7+ (mine is 5.7.26)
Error is:
Expression #1 of ORDER BY clause is not in GROUP BY clause and contains
nonaggregated column 'dbname.VALn.value' which is not functionally dependent on
columns in GROUP BY clause; this is incompatible with
sql_mode=only_full_group_by
This is very sad because most of providers doesn't permit sql_mode (strict)
modifications.
Also filter actions doesn't works anymore.
Any suggestion?