MaxGekk opened a new pull request #26256: [WIP][SPARK-29605][SQL] Optimize string to interval casting URL: https://github.com/apache/spark/pull/26256 ### What changes were proposed in this pull request? In the PR, I propose new function `stringToInterval()` in `IntervalUtils` for converting `UTF8String` to `CalendarInterval`. The function is used in casting a `STRING` column to an `INTERVAL` column. ### Why are the changes needed? The proposed implementation is ~10 times faster. For example, parsing 9 interval units on JDK 8: Before: ``` 9 units w/ interval 14004 14125 116 0.1 14003.6 0.0X 9 units w/o interval 13785 14056 290 0.1 13784.9 0.0X ``` After: ``` 9 units w/ interval 1343 1344 1 0.7 1343.0 0.3X 9 units w/o interval 1345 1349 8 0.7 1344.6 0.3X ``` ### Does this PR introduce any user-facing change? No ### How was this patch tested? - By new tests for `stringToInterval` in `IntervalUtilsSuite` - By existing tests
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