John Lonergan created FLINK-14174:
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Summary: Don't swallow exception when rethrowing type mismatches
with side outputs
Key: FLINK-14174
URL: https://issues.apache.org/jira/browse/FLINK-14174
Project: Flink
Issue Type: Improvement
Components: API / DataStream
Affects Versions: 1.9.0, 1.8.1
Reporter: John Lonergan
The change made by https://github.com/apache/flink/pull/4663/files swallows the
original exception.
Whilst I am in favour of adding additional helpful tips (which was the purpose
of FLINK-4663) I don't agree with throwing away or masking causal exceptions.
IMHO the correct approach is to add the helpful hint as the first arg to "new
ExceptionInChainedOperatorException(msg, ex)" and pass the original class cast
ex as the cause.
Ie change this ..
https://github.com/apache/flink/blob/master/flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/tasks/OperatorChain.java#L672
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