Bruce Momjian <bruce@momjian.us> writes:
> That's a possibility, but we obviously have been adding columns
> out-of-order for several releases now and no one has complained.
On balance I'm for rationalizing this. The query_start time is
logically associated with current_query and waiting, so it ought
to be next to them. Without the historical fact that we've mucked
with the column ordering before, I might've voted differently.
regards, tom lane