Github user szczeles commented on the issue:
https://github.com/apache/spark/pull/14540
@holdenk I've checked setSeed methods in MLlib and it seems py4j handles
them well. If function gets simple arguments (strings, numerric, bool), py4j
applies conversion between types (see
https://github.com/bartdag/py4j/blob/master/py4j-java/src/main/java/py4j/reflection/MethodInvoker.java#L99).
For setSeed(Long), if argument is mapped to Integer, it goes through
toString and Long.parseLong (see
https://github.com/bartdag/py4j/blob/master/py4j-java/src/main/java/py4j/reflection/TypeConverter.java#L88)
Apparently, this conversion does not work for complex types like
fromOffsets map.
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