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https://issues.apache.org/jira/browse/SPARK-23924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16435543#comment-16435543
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Apache Spark commented on SPARK-23924:
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User 'kiszk' has created a pull request for this issue:
https://github.com/apache/spark/pull/21053

> High-order function: element_at
> -------------------------------
>
>                 Key: SPARK-23924
>                 URL: https://issues.apache.org/jira/browse/SPARK-23924
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>    Affects Versions: 2.3.0
>            Reporter: Xiao Li
>            Priority: Major
>
> Ref: https://prestodb.io/docs/current/functions/array.html and 
> https://prestodb.io/docs/current/functions/map.html 
> * element_at(array<E>, index) → E
> Returns element of array at given index. If index > 0, this function provides 
> the same functionality as the SQL-standard subscript operator ([]). If index 
> < 0, element_at accesses elements from the last to the first.
> * element_at(map<K, V>, key) → V
> Returns value for given key, or NULL if the key is not contained in the map.



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