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Posted to issues@spark.apache.org by "Gengliang Wang (Jira)" <ji...@apache.org> on 2022/08/17 22:04:00 UTC
[jira] [Resolved] (SPARK-40109) New SQL function: get()
[ https://issues.apache.org/jira/browse/SPARK-40109?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Gengliang Wang resolved SPARK-40109.
------------------------------------
Fix Version/s: 3.4.0
Resolution: Fixed
Issue resolved by pull request 37541
[https://github.com/apache/spark/pull/37541]
> New SQL function: get()
> -----------------------
>
> Key: SPARK-40109
> URL: https://issues.apache.org/jira/browse/SPARK-40109
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 3.4.0
> Reporter: Gengliang Wang
> Assignee: Gengliang Wang
> Priority: Major
> Fix For: 3.4.0
>
>
> Currently, when accessing array element with invalid index under ANSI SQL mode, the error is like:
> {quote}[INVALID_ARRAY_INDEX] The index -1 is out of bounds. The array has 3 elements. Use `try_element_at` and increase the array index by 1(the starting array index is 1 for `try_element_at`) to tolerate accessing element at invalid index and return NULL instead. If necessary set "spark.sql.ansi.enabled" to "false" to bypass this error.
> {quote}
> The provided solution is complicated. I suggest introducing a new method get() which always returns null on an invalid array index. This is from [https://docs.snowflake.com/en/sql-reference/functions/get.html.]
> Since Spark's map access always returns null, let's don't support map type in the get method for now.
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