On 2017-12-06 12:14:24 -0500, Tom Lane wrote:
> Checking out hashint8() on random data shows no such obvious fault.
> You've apparently got a data set that exposes a weakness in hashint8,
> but it's not very clear what that is.
It's intentionally designed to cause problems afaict:
http://archives.postgresql.org/message-id/861b9f1f-cdc0-bc49-2595-80bc39c37dc3%40blackducksoftware.com
> In any case, the hashtable code needs to not fall over in the
> presence of a lot of collisions, regardless of the exact reason
> for there being a lot.
Yes, we need to be more resilient about it. Working on a patch.
Greetings,
Andres Freund
