Github user chiwanpark commented on the issue:
https://github.com/apache/flink/pull/2459
Hi @shijinkui, thanks for opening pull request. Unfortunately, this pull
request cause a problem with maven shading plugin
(https://issues.apache.org/jira/browse/MSHADE-200). Due to the problem, Flink
community decided to use version string instead of property and add to a shell
script (tools/change-scala-version.sh) to convert Scala version.
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