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Some Fuel sites I have migrated to a new server, and on at least 2 occasions (so far) the Blog module has hit errors regarding MySQL 1055 error (where MySQL is v5.7.23).
In the Blog users and posts models' common queries, there is only 1 column in the GROUP BY, but this is denied by the MySQL settings.
I fixed the errors using:
posts model _common_query()
$this->db->group_by([$this->_tables['blog_posts'].'.id', $this->_tables['blog_users'].'.display_name' ]);
and in users model _common_query():