[HACKERS] ORDER BY

[Marc G. Fournier]

Just curious as to whether or not a warning or something should be issued 
in a case like:

  SELECT c.*
    FROM company c, company_summary cs
   WHERE c.id = cs.id
     AND cs.detail = 'test'
ORDER BY cs.fullname;

Unless I'm missing something, the ORDER BY clause has no effect, but an 
EXPLAIN shows it does take extra time, obviously ...

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