[jira] [Assigned] (SPARK-29870) Unify the logic of multi-units interval string to CalendarInterval

["Wenchen Fan (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-29870?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wenchen Fan reassigned SPARK-29870:
-----------------------------------

    Assignee: Kent Yao

> Unify the logic of multi-units interval string to CalendarInterval
> ------------------------------------------------------------------
>
>                 Key: SPARK-29870
>                 URL: https://issues.apache.org/jira/browse/SPARK-29870
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 3.0.0
>            Reporter: Kent Yao
>            Assignee: Kent Yao
>            Priority: Major
>
> We now have two different implementation for multi-units interval strings to CalendarInterval type values.
> One is used to covert interval string literals to CalendarInterval. This approach will re-delegate the interval string to spark parser which handles the string as a `singleInterval` -> `multiUnitsInterval`  -> eventually call `IntervalUtils.fromUnitStrings`
> The other is used in `Cast`,  which eventually calls `IntervalUtils.stringToInterval`. This approach is ~10 times faster than the other.
> We should unify these two for better performance and simple logic.



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