On Mar 21, 2007, at 5:11 AM, Tom Lane wrote:

I'm inclined not to worry about these, since changing them can't affect
the semantics of the query, at worst its performance.

Hrm... wasn't that option added in case there was a bug in the exclusion code? I certainly can't think of any performance reason why you'd want to disable it... so it might be worth invalidating plans if it changes.
Jim Nasby                                            [EMAIL PROTECTED]
EnterpriseDB      http://enterprisedb.com      512.569.9461 (cell)

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TIP 9: In versions below 8.0, the planner will ignore your desire to
      choose an index scan if your joining column's datatypes do not

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