sunchao commented on PR #4819: URL: https://github.com/apache/arrow-rs/pull/4819#issuecomment-1721499590
> I recall you mentioning the dictionary encoding overheads were very high in your workloads Thanks @tustvold ! Yes, we observed the columnar-to-row conversion for dictionary encoding incurs quite some overhead. Even in my current vectorized hash table POC, which is based of [`GroupValuesRows`](https://github.com/apache/arrow-datafusion/blob/main/datafusion/core/src/physical_plan/aggregates/group_values/row.rs#L89), the conversion takes about 30% of total hash table time, measured from running `tpch_mem` and `clickbench_1`. -- 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]
