Fabian Hueske created FLINK-8013:
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Summary: Check of AggregateFunction merge function signature is
too strict.
Key: FLINK-8013
URL: https://issues.apache.org/jira/browse/FLINK-8013
Project: Flink
Issue Type: Bug
Components: Table API & SQL
Affects Versions: 1.4.0
Reporter: Fabian Hueske
Assignee: Fabian Hueske
The {{AggregationCodeGenerator}} checks that a user-defined
{{AggregateFunction}} implements all required methods. However, the check for
the {{merge(accumulator: ACC, its: java.lang.Iterable\[ACC\]): Unit}} method is
too strict and rejects valid UDAGGs.
This happens for more complex accumulators such as
{{Array\[org.apache.flink.api.java.tuple.Tuple2\[java.lang.Integer,
java.lang.Float\]\]}} because generic types are lost such that the check of the
argument types of {{merge}} fails.
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