Github user rmetzger commented on the issue:
https://github.com/apache/flink/pull/2673
I tried reproducing the issue reported by @fhueske. The only issue I got
was `Caused by: org.codehaus.commons.compiler.CompileException: Line 8, Column
13: Class "org.apache.calcite.rel.metadata.MetadataDef" not found`.
I think that'll be fixed with CALCITE-1461. I guess @fhueske's issue is
something local with the development environment.
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