Sean Owen deleted SPARK-19195:

> collection function:index
> -------------------------
>                 Key: SPARK-19195
>                 URL: https://issues.apache.org/jira/browse/SPARK-19195
>             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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