Stefan Richter created FLINK-4883:
-------------------------------------
Summary: Prevent UDFs implementations through Scala singleton
objects
Key: FLINK-4883
URL: https://issues.apache.org/jira/browse/FLINK-4883
Project: Flink
Issue Type: Bug
Reporter: Stefan Richter
Currently, user can create and use UDFs in Scala like this:
{code}
object FlatMapper extends RichCoFlatMapFunction[Long, String, (Long, String)] {
...
}
{code}
However, this leads to problems as the UDF is now a singleton that Flink could
use across several operator instances, which leads to job failures. We should
detect and prevent the usage of singleton UDFs.
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