edmondop opened a new issue, #11618: URL: https://github.com/apache/datafusion/issues/11618
### Is your feature request related to a problem or challenge? When writing a new UDF, a developer needs to decide how to perform error management in functions that return `Result`, such as `return_type` and `invoke`. Looking at the existing codebase it is not obvious what are the error management best practice # Errors in return type - Regexp like uses an `plan_err` data types of args do not match the expected types https://github.com/apache/datafusion/blob/77311a5896272c7ed252d8cd53d48ec6ea7c0ccf/datafusion/functions/src/regex/regexplike.rs#L74 . Is this check redundant? - Except expects two arguments but doesn't check the length, just the type https://github.com/apache/datafusion/blob/77311a5896272c7ed252d8cd53d48ec6ea7c0ccf/datafusion/functions-array/src/except.rs#L55. # Errors in invoke In the resize function, there is a check on argument lengths in invoke which is not present in the `return_type` function https://github.com/apache/datafusion/blob/77311a5896272c7ed252d8cd53d48ec6ea7c0ccf/datafusion/functions-array/src/resize.rs#L27 The same function also returns `exec_err`, and `internal_datafusion_err` ### Describe the solution you'd like As a developers of custom UDF I would like to know: - what errors I need to check for and what are already checked by the planner (number of arguments?) - what type of errors need to be raised in which conditions ### 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: github-unsubscr...@datafusion.apache.org.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: github-unsubscr...@datafusion.apache.org For additional commands, e-mail: github-h...@datafusion.apache.org
