Re: Removing unneeded self joins

[Richard Guo]

FWIW, I reported some issues with this commit in [1].  Any thoughts on
how to fix them?

[1] 
https://www.postgresql.org/message-id/flat/CAMbWs49PE3CvnV8vrQ0Dr%3DHqgZZmX0tdNbzVNJxqc8yg-8kDQQ%40mail.gmail.com

Thanks
Richard