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https://issues.apache.org/jira/browse/SPARK-29870?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16972992#comment-16972992
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Kent Yao commented on SPARK-29870:
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working on this
> 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
> 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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