Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/6243#issuecomment-103215413
Do those builds run unit tests?
The issue is when you run the spark-sql unit tests; unit tests are run
against the unshaded classes, so `SQLContext` still references
`JavaTypeInference.inferDataType(com.google.common.reflect.TypeToken)`. But the
`JavaTypeInference` class in the classpath now would come from the catalyst
jar, which would have been shaded, and would have a different signature
(`JavaTypeInference.inferDataType(org.spark-project.guava.reflect.TypeToken)`).
And the test would fail with a "NoSuchMethodError" or something.
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