Jan Wieck <JanWieck@Yahoo.com> writes:
> Do we have any hard numbers on that? Is it just access to the header
> fields, or do we loose the offset cacheability of all fixed size fields
> at the beginning of a row? In the latter case count me into the
> slowness-believer camp.
I don't believe the patch would have made the header variable size,
only changed what the fixed size is. The slowdown I was worried about
was just a matter of a couple extra tests and branches in the tqual.c
routines; which would be negligible if they weren't such hotspots.
regards, tom lane