Jeff Janes <jeff.janes@gmail.com> writes:
> Is there a reason to not just elog the HJDEBUG stuff?
Yes --- it'd be expensive (a "no op" elog is far from free) and
useless to ~ 99.999% of users.
Almost all the conditionally-compiled debug support in the PG executor
is legacy leftovers from Berkeley days. If it were useful more often
than once in a blue moon, we probably would have made it more easily
reachable long ago. I'm a bit surprised we haven't just ripped it
out, TBH. When I find myself needing extra debug output, it's almost
never the case that any of that old code does what I need.
There might be a case for changing it all to print to stderr not
stdout, so that it plays more nicely with elog/ereport output
when you do have it turned on, though.
regards, tom lane