"D'Arcy J.M. Cain" <darcy@druid.net> writes:
> How about a rule that says no new ode without a test?

We've got way too many tests like that already, ie, a bunch of
mostly-redundant functional tests of isolated new features.
Most of the code I worry about there isn't any simple way to
test from the SQL level --- the fact that a query gives the
right answer doesn't prove it went through a particular part
of the planner, for example.

I think we need some intelligent test design, not tests thrown in
to meet a rule.

                        regards, tom lane

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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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