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https://issues.apache.org/jira/browse/SPARK-19194?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15821956#comment-15821956
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Sean Owen commented on SPARK-19194:
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This issue has become corrupted somehow by JIRA and I'll have to delete it.
Could you reopen it? More detail would be useful, and please don't set Target.
> collection function: index
> --------------------------
>
> Key: SPARK-19194
> URL: https://issues.apache.org/jira/browse/SPARK-19194
> Project: Spark
> Issue Type: Sub-task
> Reporter: Chenzhao Guo
>
> Expression Index returns the value of index n (right) of the array/map (left).
> To be consistent with Hive, the left parameter should be of ArrayType or
> MapType, while the right parameter should be of AtomicType or NullType.
> Except the rules above, Hive won't throw any exceptions, even if there's a
> type mismatch, it will output NULL to indicate not found. This implementation
> follows the rule.
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