wuchong commented on issue #9193: [FLINK-13318][table-planner-blink] Fix Blink planner tests failing on Scala 2.12 by setting SerialVersionUID of UDF explicitly URL: https://github.com/apache/flink/pull/9193#issuecomment-514028089 Hi @twalthr , this is because 1. we print the udf's md5 into the node explanation. 2. blink planner uses xml to verify plan, the xml content is immutable between different Scala versions. 3. the serialization behavior is different between Scala 2.11 and 2.12 when version id is not defined. That's why we add version id to all existing scala udfs. But this doesn't mean we force users to set this. This is just a workaround for the plan test for different Scala versions. Users can still use a Scala udf without version id in blink planner and flink planner. > why are only Blink tests affected by this? Flink uses `"${func.functionIdentifier}"` to generate plan content, so that it can adapt to different Scala versions automatically.
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