Tom Lane wrote:
The infrastructure for the former planning method (using the first Bind's parameters as sample values for estimation, but not as constants) is still there, but it's not being used now. Does anyone want to argue for changing things to plan named statements that way? I'm of two minds about it myself; you can make a good case that it'd usually be a win, but it's also not hard to envision scenarios where it'd be a loss.
Although I don't have a clear opinion myself, I sometimes read on this list that people are using prepared statements to get safe, stable plans, i.e. plans that don't depend on the specific parameter input.
If you change that, I don't think they will be happy at all. I suggest leaving it as-is for 8.2. I think the user (i.e. driver) should be able to tell the backend, if they want planning for the first bind, or right at prepare.
Best Regards Michael Paesold ---------------------------(end of broadcast)--------------------------- TIP 6: explain analyze is your friend
