[HACKERS] Covering + unique indexes

[Andreas Joseph Krogh]

Any reason $subject didn't make it (commited but reverted)?
 
This is a great feature and lots of work seems to have been put into this 
patch along with quite some reviewing. It would be nice to know why -hackers 
think it's not ready for 9.6.
 
Thanks.
 
-- Andreas Joseph Krogh