alamb commented on a change in pull request #307:
URL: https://github.com/apache/arrow-datafusion/pull/307#discussion_r630079422
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File path: datafusion/src/physical_plan/functions.rs
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@@ -1373,20 +1374,28 @@ impl PhysicalExpr for ScalarFunctionExpr {
}
fn evaluate(&self, batch: &RecordBatch) -> Result<ColumnarValue> {
Review comment:
I think this approach, while a hack, seems reasonable to me
I agree with the comments on
https://github.com/apache/arrow-datafusion/pull/303#discussion_r629859725 that
this does seem like a hack (it would be nicer to have an enum or something that
made this case explicit).
I would like to see this expectation documented near the place where a user
would define a UDF as well - either as an example or as a doccomment. Perhaps
somewhere in
https://github.com/apache/arrow-datafusion/blob/master/datafusion/src/physical_plan/udf.rs
Or bonus points for adding an example:
https://github.com/apache/arrow-datafusion/blob/master/datafusion-examples/examples/simple_udf.rs
cc; @msathis who I think faced a similar challenge in `now()`:
https://github.com/apache/arrow-datafusion/pull/288
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