Dandandan opened a new issue, #4476: URL: https://github.com/apache/arrow-rs/issues/4476
**Is your feature request related to a problem or challenge? Please describe what you are trying to do.** <!-- A clear and concise description of what the problem is. Ex. I'm always frustrated when [...] (This section helps Arrow developers understand the context and *why* for this feature, in addition to the *what*) --> In DataFusion, a common operation is to repartition a RecordBatch by hashing one or more columns and dividing them into `partition` record batches using the "formula" `hash % num_partitions`. The current approach is to create the indices that match and use them to `take` the individual arrays (see `BatchPartitioner` in datafusion). This is relatively expensive however, as we visit the arrays `num_partitions` times in different places, leading to cache inefficient. **Describe the solution you'd like** <!-- A clear and concise description of what you want to happen. --> I would like to have a method in arrow-rs that takes an Array with `partition` numbers (0..) and spreads the rows of the Array(s) into a `Vec<Array>` and/or `Vec<RecordBatch>`. **Describe alternatives you've considered** <!-- A clear and concise description of any alternative solutions or features you've considered. --> **Additional context** <!-- Add any other context or screenshots about the feature request here. --> -- 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]
