Hello! > 18 янв. 2018 г., в 10:48, Kyotaro HORIGUCHI <horiguchi.kyot...@lab.ntt.co.jp> > написал(а): > > Gist imposes the ninth strategy to perform index only scan but > planner is not considering that > .... > Please find the attached patch. I agree with you that current behavior is a bug and your patch seems correct. I'm a bit worried about ninth strategy words: fetch is not necessary now, if opclass lacks compress methods - index only scan is possible. See https://github.com/postgres/postgres/commit/d3a4f89d8a3e500bd7c0b7a8a8a5ce1b47859128 for details. Though there are tests in cube and seg for that, if your patch passes check-world, than this behavior is not affected.
Thank you for the patch! Best regards, Andrey Borodin.
