zhengruifeng opened a new pull request, #37829: URL: https://github.com/apache/spark/pull/37829
### What changes were proposed in this pull request? 1, add a dedicated expression for `DataFrame.cov`; 2, add missing parameter `ddof` in `DataFrame.cov` ### Why are the changes needed? for api coverage ### Does this PR introduce _any_ user-facing change? yes, API change ### How was this patch tested? added tests -- 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]
