alamb opened a new issue, #8583: URL: https://github.com/apache/arrow-datafusion/issues/8583
### Is your feature request related to a problem or challenge? This type of function is important in streaming usecases and the goal is to support multiple order aware normal (as opposed to window) aggregates such as various N'th value, rank functions, etc. These would be both for built in functions and user defined aggregates. At the time of writing DataFusion supports three aggregate functions that can be "order aware": `ARRAY_AGG`, `FIRST_VALUE` and `LAST_VALUE`. This means that you can supply a `ORDER BY` clause to their argument, for example `FIRST_VALUE(x ORDER BY time)`. This Epic captures plans related to improving support - [ ] 2. There is no way to create a user defined aggregate order aware aggregate ### Describe the solution you'd like _No response_ ### Describe alternatives you've considered _No response_ ### Additional context _No response_ -- 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]
