Github user yhuai commented on the pull request:
https://github.com/apache/spark/pull/7813#issuecomment-126753589
Seems even if we use a single element of an array or a struct (e.g.
`array[0]`) in the grouping expression, we do not get the item until we start
the aggregate operator, which caused the problem of
`java.lang.UnsupportedOperationException: Not supported DataType:
ArrayType(StringType,true)`.
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