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https://issues.apache.org/jira/browse/SPARK-23924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16431002#comment-16431002
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Kazuaki Ishizaki commented on SPARK-23924:
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I will work for this.
> 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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