Github user chenghao-intel commented on the pull request: https://github.com/apache/spark/pull/6828#issuecomment-112662507 There are 2 Struct UDFs in Hive: https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/udf/generic/GenericUDFStruct.java (struct) https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/udf/generic/GenericUDFNamedStruct.java (named_struct) For the previous one, we will give the default names for its fields, but for the later, we will create the struct type by given names. We need to implement both of them, but this PR seems only for solve the bug of the former one.
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