Dandandan opened a new issue #717: URL: https://github.com/apache/arrow-datafusion/issues/717
**Is your feature request related to a problem or challenge? Please describe what you are trying to do.** While looking at adding support for more statistics on the Delta Lake `TableProvider` implementation I bumped into some limitation in our statistics API. Currently columnstatistics is a `Option<Vec<ColumnStatistics>>`. https://github.com/apache/arrow-datafusion/blob/master/datafusion/src/datasource/datasource.rs#L37 So, it should return the statistics by (correct) index regardless of the order in the files. **Describe the solution you'd like** Either: * Return a `HashMap<String, ColumnStatistics>` rather than a `Option<Vec<ColumnStatistics>>` * Pass a `Schema` parameter to `TableProvider::statisitics` so the position can be found out. FWIW, Delta Lake / delta-rs takes the first approach and seems straightforward to implement and use. **Describe alternatives you've considered** **Additional context** -- 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]
