seems a change in master broke this. I built against master and get a similar 
error when running the `cat` tool:
 ```
☁  parquet-tools [master] mvn -DskipTests=true package -Plocal
...
☁  parquet-tools [master] java -jar target/parquet-tools-1.10.1-SNAPSHOT.jar  
cat -debug -j 
/tmp/foobar/part-00000-1ca7e0f8-30ab-4ce9-860d-a791e2df081e-c000.snappy.parquet 
 
java.lang.ClassCastException: required int32 element is not a group
```

I will investigate a fix

[ Full content available at: https://github.com/apache/parquet-mr/pull/518 ]
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