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From "Kazuaki Ishizaki (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-23924) High-order function: element_at
Date Mon, 09 Apr 2018 18:16:00 GMT

    [ https://issues.apache.org/jira/browse/SPARK-23924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16431002#comment-16431002
] 

Kazuaki Ishizaki commented on SPARK-23924:
------------------------------------------

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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