On Wed, Jan 22, 2020 at 10:55 AM Peter Geoghegan <p...@bowt.ie> wrote: > This is a good summary. This is the kind of scenario I had in mind > when I expressed a general concern about "stopping between pages". > Processing a whole page at a time is a crucial part of how > _bt_readpage() currently deals with concurrent page splits.
Note in particular that index scans cannot return the same index tuple twice -- processing a page at a time ensures that that cannot happen. Can a loose index scan return the same tuple (i.e. a tuple with the same heap TID) to the executor more than once? -- Peter Geoghegan
