Did some search on it and it's a revelation for me too.

Here's what I understand based on all the articles I've read:

It's not the problem with DB adapters, it's because of the difference in how 
MySQL implements "group by" clause

http://dev.mysql.com/doc/refman/5.0/en/group-by-hidden-columns.html

Strictly speaking, both the adapters are implementing what's right as per 
each database.
And since MySQL chose to implement "group by" clause differently and most 
rails devs have been using mysql as default database, we are used to use 
"group by" the mysql way.

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