Github user fhueske commented on the issue:
https://github.com/apache/flink/pull/6082
I think we have to return an typed array here. A `List` won't be supported
by the built-in SQL functions.
There are a few tricks on can play to create typed arrays, even in static
code like
```
Object[] array = (Object[]) Array.newInstance(clazz, length);
```
Have a look at the code of the ORC InputFormat that had to solve a similar
challenge:
[OrcBatchReader.java](https://github.com/apache/flink/blob/master/flink-connectors/flink-orc/src/main/java/org/apache/flink/orc/OrcBatchReader.java).
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