Github user yhuai commented on the pull request:
https://github.com/apache/spark/pull/3431#issuecomment-68981491
@marmbrus told me that `<>` is a delimiter defined in
https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/SparkSQLParser.scala#L63.
So, seems we need to handle `struct<>` specially for now.
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