Nandakumar M <> writes:
> The order by column has a not null constraint on it and so nulls last or
> first shouldn't make any difference.

The planner does not consider this and it doesn't really seem like
something worth expending cycles on.  If you know that there won't be
nulls in the column, why are you insisting on specifying a nondefault
value of NULLS FIRST/LAST in the query?

                        regards, tom lane

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