alain radix <> writes:
> Another effect of the patch is that it become possible to start a cluster
> with external_pid_file='' in postgresql.conf
> It would have that same behavior as many other parameters.

I'd still be inclined to do that with something along the lines of

-       if (external_pid_file)
+       if (external_pid_file && external_pid_file[0])

rather than changing the default per se.

                        regards, tom lane

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