Github user fhueske commented on the issue:
https://github.com/apache/flink/pull/2673
The problem is only present if the Flink application is compiled with the
Scala compiler. If I use the Java Quickstart, everything works until the
CALCITE-1461 bug appears. @rmetzger pointed me into the right direction. The
Scala compiler does not rely on pure bytecode but seems to bypass some type and
package information in a so-called `ScalaSig` attribute which is not evaluated
by the Java compiler. Apparently, the Maven Shade plugin does not update this
special Scala attribute.
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