alamb commented on PR #2177: URL: https://github.com/apache/arrow-datafusion/pull/2177#issuecomment-1135961673
I think adding UDTFs (aka user defined table functions) that produce a 2 dimensional table output (aka `Vec<RecordBatch>` or a `SendableRecordBatchStream`) would be a valuable addition to DataFusion. I think Spark calls these "table value functions": https://docs.databricks.com/spark/latest/spark-sql/language-manual/sql-ref-syntax-qry-select-tvf.html Postgres calls them table functions: https://www.postgresql.org/docs/7.3/xfunc-tablefunctions.html However, this PR does not implement table functions that I can see. I still don't fully understand the usecase for the code in this PR for a function that returns a single column of values and I don't know of any other system that implements such functions. Thus I feel that this PR adds a feature that is not widely usable to DataFusion users as a whole, and so I don't feel I can approve it. If others (users or maintainers) have a perspective on this issue, I would love to hear them too. If there is broader support for this feature, I won't oppose merging it. -- 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]
