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> That was a pretty special case (LIKE/regex estimation), and we've since
> eliminated the threshold change in the LIKE/regex estimates anyway, so
> there's no longer any reason to pick 100 as opposed to any other number.
> So we're still back at "what's a good value and why?".
Glad to hear that, although I think this is only in HEAD, not backpatched,
right? Well at any rate, I withdraw my strong support for 100 and join in
the quest for a good number. The "anything but 10" campaign.
> I'm still concerned about the fact that eqjoinsel() is O(N^2). Show me
> some measurements demonstrating that a deep nest of equijoins doesn't
> get noticeably more expensive to plan --- preferably on a datatype with
> an expensive equality operator, eg numeric --- and I'm on board.
I hope someone else on the list can do this, because I can't. :)
- --
Greg Sabino Mullane greg@turnstep.com
PGP Key: 0x14964AC8 200806122054
http://biglumber.com/x/web?pk=2529DF6AB8F79407E94445B4BC9B906714964AC8
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