On Tue, Jan 1, 2019 at 10:08 PM Tomas Vondra <tomas.von...@2ndquadrant.com> wrote:
> The execution part of the patch seems to be working correctly, but I > think there's an improvement - we don't need to execute the outer plan > to completion before emitting the first row. For example, let's say the > outer plan produces 10000 rows in total and we're supposed to return the > first 1% of those rows. We can emit the first row after fetching the > first 100 rows, we don't have to wait for fetching all 10k rows. > > my other concern is in this case we are going to determine limit and safe row to return on the fly which have additional computation and i fair that it will not perform better on most of the case regards Surafel
