Re: Using PQexecQuery in pipeline mode produces unexpected Close messages

At Tue, 21 Jun 2022 14:56:40 +0900 (JST), Kyotaro Horiguchi <horikyota.ntt@gmail.com> wrote in 
> By the way, I noticed that "libpq_pipeline uniqviol" intermittently
> fails for uncertain reasons.
> 
> > result 574/575: pipeline aborted
> > ...........................................................
> > done writing
> > 
> > libpq_pipeline:1531: got unexpected NULL

PQsendQueryPrepared() is called after the conection's state has moved
to PGASYNC_IDLE so PQgetResult returns NULL. But actually there are
results.  So, if pqPipelineProcessorQueue() doesn't move the async
state to PGASYNC_IDLE when queue is emtpy, uniqviol can run till the
end. But that change breaks almost all of other test items.

Finally, I found that the change in pqPipelineProcessorQueue() as
attached fixes the uniqviol failure and doesn't break other tests.
However, I don't understand what I did by the change for now... X(
It seems to me something's wrong in the PQ_PIPELINE_ABORTED mode..

regards.

-- 
Kyotaro Horiguchi
NTT Open Source Software Center