Hi,
This is not very obvious and looks like a bug.
I have a lambda expression to get key from objects in stream:
This works:
stream.keyBy(value -> value.getId())
This does not:
stream.keyBy(myClass::getId)
Exception:
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: -1
at
org.apache.flink.api.java.typeutils.TypeExtractor.getUnaryOperatorReturnType(TypeExtractor.java:294)
at
org.apache.flink.api.java.typeutils.TypeExtractor.getKeySelectorTypes(TypeExtractor.java:253)
at
org.apache.flink.api.java.typeutils.TypeExtractor.getKeySelectorTypes(TypeExtractor.java:246)
at
org.apache.flink.streaming.api.datastream.KeyedStream.<init>(KeyedStream.java:87)
at
org.apache.flink.streaming.api.datastream.DataStream.keyBy(DataStream.java:241)
Can someone confirm this? or is there a better way to do it?
Thanks!
Andrew
--
Confidentiality Notice: This e-mail transmission may contain confidential
or legally privileged information that is intended only for the individual
or entity named in the e-mail address. If you are not the intended
recipient, you are hereby notified that any disclosure, copying,
distribution, or reliance upon the contents of this e-mail is strictly
prohibited and may be unlawful. If you have received this e-mail in error,
please notify the sender immediately by return e-mail and delete all copies
of this message.
