huaxingao opened a new issue, #6549: URL: https://github.com/apache/iceberg/issues/6549
### Feature Request / Improvement NDV is important information for query optimization. Currently, Trino calculates NDV statistics during analyzing table and writes NDV statistics to the Iceberg puffin file. These NDV statistics are used by the Trino query optimizer to find the best query plan. However, iceberg table level NDV is not collected and used by Spark engine yet. I have a [proposal](https://docs.google.com/document/d/1ZvTw9G2rLuETREC1MCoZubvHo2SpwTpEz_58F9jy07I/edit) to collect iceberg NDV for Spark engine so this info can be used for Spark query optimization. ### Query engine Spark -- 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] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
