"Tom Lane" <[EMAIL PROTECTED]> writes: > Jeff Davis <[EMAIL PROTECTED]> writes: >> On Sun, 2008-01-13 at 18:52 -0500, Tom Lane wrote: >>> I wonder whether there are any other places that are silently assuming >>> that heapscans start from page zero ... > >> I considered that question when implementing sync scans, but I could not >> think of any specific areas of the code that would likely be affected. > > I went through all of the heap_beginscan calls in the code last night. > pgstattuple was broken but AFAICS none of the other callers care about > the visitation order. I wonder though about third-party add-ons :-(
Perhaps we ought to have made heap_beginscan guarantee an ordered scan and made synch scans be explicitly requested. That would have touched a lot of lines but been more conservative. I'm not sure it's worth going back on it now though. -- Gregory Stark EnterpriseDB http://www.enterprisedb.com Ask me about EnterpriseDB's Slony Replication support! ---------------------------(end of broadcast)--------------------------- TIP 6: explain analyze is your friend
