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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2022/04/15 10:08:02 UTC

[GitHub] [arrow-datafusion] thinkharderdev commented on pull request #2177: udtf support

thinkharderdev commented on PR #2177:
URL: https://github.com/apache/arrow-datafusion/pull/2177#issuecomment-1100014400

   > Hmmmm...I have some problems about this pr. If we treat UDTF as an expression, does it mean that it can only produce one column? As I mentioned before ([#2177 (comment)](https://github.com/apache/arrow-datafusion/pull/2177#issuecomment-1094208748)), it's more like a table so that we can `select * from` it and get any number of columns. I'm confused, would you please explain it to me? @alamb @gandronchik
   
   I had the same question. I'm not sure I understand how this is different from a scalar function. It seems like a table function should produce `RecordBatch`s and effectively compile down to an `ExecutionPlan`. 


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