Re: TopoSort() fix

On Mon, Jul 29, 2019 at 9:48 PM Tom Lane <tgl@sss.pgh.pa.us> wrote:
> I tried that first.  There are backstops preventing doing LOCK TABLE
> in a worker, just like for advisory locks.
>
> I believe the only accessible route to taking any sort of new lock
> in a parallel worker is catalog lookups causing AccessShareLock on
> a catalog.

Can't the worker just query a previously-untouched table, maybe by
constructing a string and then using EXECUTE to execute it?

-- 
Robert Haas
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