hareshkh commented on code in PR #25828:
URL: https://github.com/apache/datafusion/pull/25828#discussion_r4122620001
##########
datafusion/core/tests/user_defined/user_defined_async_scalar_functions.rs:
##########
@@ -89,6 +89,35 @@ async fn test_async_udf_with_non_modular_batch_size() ->
Result<()> {
Ok(())
}
+// An async UDF may return a scalar when all of its arguments are scalars. The
+// scalar applies to every row, so it must be expanded to the number of rows in
+// each chunk rather than to a single row.
+#[tokio::test]
+async fn test_async_udf_with_scalar_result() -> Result<()> {
Review Comment:
Without the fix fails with:
```
Error: ArrowError(InvalidArgumentError("all columns in a record batch must
have the same length"), Some(""))
```
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