I had your prior message on my "to look at" list; the behavior seems
pretty odd.  Two questions:

  1.  Which version are you running, exactly?

  2.  Might 'peripherals & access' happen to be the largest (last in
      sort order) keyword present in your table?

If #2 is true, then this might represent some sort of boundary-condition
misbehavior in the cost estimator.  But I don't see anything like it
happening in current sources.

                        regards, tom lane

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