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?
Oh, and if you wanted to go bigger - the next planning issue people seem
to have is with our union planning...
Chris
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