Hello, It seems that Avro fails to serialise POJOs that contain non-String or stringable keys<https://apache.googlesource.com/avro/+/40650540dcb8ca8a6b6235de5cdd36c0f6e2eb31/lang/java/avro/src/main/java/org/apache/avro/reflect/ReflectData.java#361>. eg. in the example here<https://github.com/senorcarbone/incubator-flink/blob/72b6798b50396c962fc6cea20a2bcdd51eec06f4/flink-examples/flink-java-examples/src/main/java/org/apache/flink/examples/java/testing/LongMapKeyIssueExample.java> I get a compiler exception caused by:
org.apache.avro.AvroTypeException: Map key class not String: class java.lang.Long Is there any known workaround/recommendation for this except for using String keys? I need this for a use case of low latency data-intensive streaming so String conversions should be avoided. Paris
