"D. Duccini" <duccini@backpack.com> writes:
> Can anyone tell me why the planner is penalizing me for changing ONE
> value?
I'm guessing that one or the other value matches the "most common value"
recorded in pg_statistic?
I'm also betting you are not on 7.2. Older versions have coarser
statistics that are more likely to make foolish decisions for
not-quite-the-most-common values ...
regards, tom lane