Gyula Fora created FLINK-4275:
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Summary: Generic Folding, Reducing and List states behave
differently from other state backends
Key: FLINK-4275
URL: https://issues.apache.org/jira/browse/FLINK-4275
Project: Flink
Issue Type: Bug
Components: State Backends, Checkpointing, Streaming
Reporter: Gyula Fora
Priority: Critical
In
https://github.com/apache/flink/commit/12bf7c1a0b81d199085fe874c64763c51a93b3bf
the expected behaviour of Folding/Reducing/List states have been changed to
return null instead of empty collections/default values.
This was adapted for the included state backends (Memory, FS, Rocks) but not
for the Generic state wrappers. As there are no tests for the Generic backend
using the StateBackendTestBase this didnt show.
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