timsaucer opened a new pull request, #15646: URL: https://github.com/apache/datafusion/pull/15646
## Which issue does this PR close? - Closes #14247 but it is a different solution than requested ## Rationale for this change We have many users who wish to use extension data or other metadata when writing user defined functions. This PR enables two features for Scalar UDFs - When invoking the UDF, the metadata of each input column will be available, if it exists - The UDF can also specify output metadata that is attached to the schema of the record batch ## What changes are included in this PR? This is a fairly large change, but at a high level we add in a vector of argument metadata to the `ScalarFunctionArgs` that gets passed when invoked. Additionally all Physical Expressions are now required to implement a new function to output their metadata. The rest of the work included is around plumbing these changes through the system, extracting the metadata from the input schema, and setting it as output. ## Are these changes tested? - All existing unit tests pass. - Additional unit test exercising this feature is added. -- 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 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
