Re: [sqlsmith] Parallel worker crash on seqscan

On Mon, Nov 21, 2016 at 12:00 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Robert Haas <robertmhaas@gmail.com> writes:
>> On Mon, Nov 21, 2016 at 11:43 AM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>>> so what we've got is a case where a parameter computed by the FunctionScan
>>> (in the master) would need to be passed into the parallel workers at
>>> runtime.  Do we have code for that at all?  If so where is it?
>
>> No, that's not supposed to happen.
>
> OK, that makes this a planner failure: we should not have allowed this
> query to become parallelized.
>
>> Maybe it's checking the quals but not recursing into the tlist?
>
> It seems like maybe searching for individual Params is the wrong thing.
> Why are we allowing it to generate a parameterized Gather path at all?
> Given the lack of any way to transmit runtime param values to the worker,
> I can't see how that would ever work.

Hmm, so you're thinking it could be the job of generate_gather_paths()
to make sure we don't do that?

-- 
Robert Haas
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