MaxGekk opened a new pull request #26455: [SPARK-29819][SQL] Introduce an enum for interval units URL: https://github.com/apache/spark/pull/26455 ### What changes were proposed in this pull request? In the PR, I propose an enumeration for interval units with the value `Year`, `Month`, `Week`, `Day`, `Hour`, `Minute`, `Second`, `Millisecond`, `Microsecond` and `Nanosecond`. ### Why are the changes needed? - This should prevent typos in interval unit names - Stronger type checking of unit parameters. ### Does this PR introduce any user-facing change? No ### How was this patch tested? By existing test suites `ExpressionParserSuite` and `IntervalUtilsSuite`
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