On Thu, Mar 17, 2016 at 7:10 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote: > > Amit Kapila <amit.kapila16@gmail.com> writes: > > While reading above code changes, it looks like it is assuming that subpath > > and subplan will always be same (as it is verifying projection capability > > of subpath and attaching the tlist to subplan), but I think it is possible > > that subpath and subplan correspond to different nodes when gating Result > > node is added on to top of scan plan by create_scan_plan(). > > A little more thought will show you that that's not actually relevant, > because the tlist computation would have happened (or not) below the > gating Result. If gating Results had an impact on > apply_projection_to_path's decisions we'd have had to do something about > that before this. >
I understand that gating Results won't impact it, but it was just not apparent from looking at the code I had referred. If you think it is quite obvious thing, then we can leave the comment as it is.
