> I'm not sure whether we'd need any additional planner knobs to control
> this. I think that the existing join_collapse_limit GUC variable should
> continue to exist, but its effect on left/right joins will be the same as
> for inner joins. If anyone wants to force join order for outer joins more
> than for inner joins, we'd need some other control setting, but I don't
> currently see why that would be very useful.
>
> Does this seem like a reasonable agenda, or am I thinking too small?
>
> regards, tom lane
>
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