Re: Let's invent a function to report lock-wait-blocking PIDs

Simon Riggs <simon@2ndQuadrant.com> writes:
> On 20 March 2013 18:02, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>> The API that comes to mind is (name subject to
>> bikeshedding)
>> 
>> pg_blocking_pids(pid int) returns int[]

> Useful. Can we also have an SRF rather than an array?

I thought about that, but at least for the isolationtester use-case,
the array result is clearly easier to use.  You can get from one to the
other with unnest() or array_agg(), so I don't really feel a need to
provide both.  Can you generate use-cases where the set-result approach
is superior?
        regards, tom lane