Github user yhuai commented on the pull request:
https://github.com/apache/spark/pull/3431#issuecomment-68982855
@scwf Actually, I tried `struct<>` with `runSqlHive` and got an exception.
https://issues.apache.org/jira/browse/HIVE-3323 seems the original hive jira
that introduced `struct<>` (for thrift support). Maybe we should not allow
users to define `struct<>` and take care it specially in
`org.apache.spark.sql.hive.MetastoreRelation$SchemaAttribute.toAttribute`?
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