Github user chenghao-intel commented on the pull request: https://github.com/apache/spark/pull/6266#issuecomment-105137973 `explode` only takes the `ArrayType` or `MapType` as child type. Not for `StructType`, See `https://cwiki.apache.org/confluence/display/Hive/LanguageManual+UDF#LanguageManualUDF-explode`
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