A QuestDB engineer here: These are cool benchmarks! The idea to try Robin Hood probing came to me after receiving some feedback on Reddit. I ran initial experiments, and the results were promising, leading to its integration into our codebase. Thank you so much for sharing your repository. Perhaps one day we'll explore bidirectional probing as well!
A snapshot of my happiness after running first experiments with Robin Hood: https://twitter.com/jerrinot/status/1730147245285150743 :)