yukkit commented on issue #2260:
URL:
https://github.com/apache/arrow-datafusion/issues/2260#issuecomment-1527280989
The reason is ```let len: usize = match &args[0] {``` .
If your udf takes no arguments, you can return `ColumnarValue::Scalar`
instead of `ColumnarValue::Array`.
If there are no other problems, I think this issue can be closed.
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