Forus0322 opened a new issue, #4140: URL: https://github.com/apache/incubator-streampark/issues/4140
### Search before asking - [X] I had searched in the [issues](https://github.com/apache/incubator-streampark/issues?q=is%3Aissue+label%3A%22improvement%22) and found no similar issues. ### Java Version 1.8 ### Scala Version 2.12.x ### StreamPark Version dev ### Flink Version 1.17 ### deploy mode None ### What happened The calculation duration ignores the condition that only start is null. ### Error Exception _No response_ ### Screenshots _No response_ ### Are you willing to submit PR? - [X] Yes I am willing to submit a PR!(您是否要贡献这个PR?) ### Code of Conduct - [X] I agree to follow this project's [Code of Conduct](https://www.apache.org/foundation/policies/conduct) -- 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: issues-unsubscr...@streampark.apache.org.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org