Andres Freund <> writes:
> On 2018-04-07 21:53:01 +0300, Teodor Sigaev wrote:
>> test select_parallel              ... FAILED
>> I don't understand how it's connected to json_to_tsquery. Can somebody point
>> me what I'm missing?

> Given that it "only" failed during upgrade check, not the earlier
> parallel check, it is possible that it's entirely unrelated and just a
> low likelihood event?

Yes.  We've seen that exact symptom before:

I have a suspicion that it's related to the significantly-more-common
plan instability we've been seeing in postgres_fdw.

                        regards, tom lane

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