return mri-like results from execute (mysql2, pg, sqlite3)

[kares]

ActiveRecord::Base.connection.execute 'SELECT ...' returns :

#<Mysql2::Result:0x000000036e06d8> ( first is the row itself: ["abcxyz"] ) while ArJdbc returns a Hash for each row: [{"title"=>"abcxyz"}]

same with PostgreSQL's PG::Result returned from execute

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