Hi Nikhil, Thanks for the updated patch - I've started working on a review, with the hope of getting it committed sometime in 2019-01. But the patch bit-rotted again a bit (probably due to d3c09b9b), which broke the last part. Can you post a fixed version?
regards -- Tomas Vondra http://www.2ndQuadrant.com PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services