@Thomas

Thanks for helping identifying the issue. I think it would be nice to clean
up those obsoleted files during the run because running out of disk is
reality not a good thing to have ;) Of course the bad estimates leading to
the resize are the real issue but this at least makes it less bad.

Thanks for the tip about disabling parallel_hash but I also found it in the
source. As mentioned before I disable (on production systems) all
parallelism, not just for this issue but to prevent the OOM killer from
killing Postgres - which happens way more often with parallelism on...

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