beliefer opened a new pull request #31178: URL: https://github.com/apache/spark/pull/31178
### What changes were proposed in this pull request? The current implement of `UnboundedOffsetWindowFunctionFrame` and `UnboundedPrecedingOffsetWindowFunctionFrame` only support `nth_value` that respect nulls. So nth_value will execute with `UnboundedWindowFunctionFrame` and `UnboundedPrecedingWindowFunctionFrame`. `UnboundedWindowFunctionFrame` and `UnboundedPrecedingWindowFunctionFrame` will call `updateExpressions` of `nth_value` multiple times. ### Why are the changes needed? Improve performance for nth_value ignore nulls over offset window ### Does this PR introduce _any_ user-facing change? No ### How was this patch tested? Jenkins test ---------------------------------------------------------------- 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. For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
