JigaoLuo commented on issue #8378: URL: https://github.com/apache/arrow-rs/issues/8378#issuecomment-3319329345
I’d like to share a simple observation related to our discussion on **the score** for compression decisions. In my recent experiments, I noticed that once the Parquet file is sorted by a pruning column, compression becomes significantly less effective—so much so that my rewrite logic often decides to skip compression entirely. By "pruning column," I’m referring to the column used for predicate filtering—typically something like a date field, rather than a key. A shallow example: when the data is sorted by date, my rewrite detects almost no size reduction across most columns, making compression unhelpful in this case. <img width="2212" height="915" alt="Image" src="https://github.com/user-attachments/assets/ac6c1f27-d7b5-48ea-85a6-62897129a962"; /> -- 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]
