Jan Prachař
Jan Prachař
This isn't a bug. Quickselect just selects 8 smallest elements and it does not guarantee anything about element at index 8.
Yes, I am able to reproduce it also with version 4.1.4-1.
For PostgeSQL you need to set [repeatable read isolation level](https://www.postgresql.org/docs/10/static/transaction-iso.html) for this transaction, otherwise the delete queries are just ignored, if a concurrent transaction deletes the same rows.
Sorry for the late reply. I am still able to reproduce it on 4.2.0-rc3 with postgres 11.
The following dockerfile reproduces the issue. ```dockerfile FROM debian:buster RUN apt update && apt upgrade -y && apt install --no-install-recommends -y \ ca-certificates \ git \ libpq-dev \ build-essential \...