Dandandan commented on issue #846: URL: https://github.com/apache/arrow-datafusion/issues/846#issuecomment-895733077
> If a column is nullable, we can use another byte to store the nullable bits. > > If [u8, u8, u16] are all nullable, u64 key can be used. How do you avoid that hashes are very similar to each other and only differ in some bits? As of now each element gets hashed using `ahash`. With grouping the values in one value I am wondering whether it's good enough for the hashtable? Or would you hash that again? -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
