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

["Kent Yao (Jira)" <ji...@apache.org>]

Kent Yao created SPARK-29870:
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             Summary: 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


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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