feat(datetime): prototype JVM UDF path for Hour/Minute/Second (engine=java)#4321

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andygrove wants to merge 15 commits into

apache:mainfrom

andygrove:datetime-jvm-udf-prototype

Commits on May 14, 2026

feat(datetime): add spark.comet.exec.datetime.engine config [skip ci]
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docs(datetime): polish COMET_DATETIME_ENGINE doc wording [skip ci]
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feat(datetime): add DateTimeFieldUDF abstract base for JVM UDFs [skip ci]
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feat(datetime): add HourUDF for JVM-side hour extraction [skip ci]
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refactor(datetime): move DateTimeFieldUDFSuite to spark module [skip ci]
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refactor(datetime): revert scalatest setup in common/pom.xml [skip ci]
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feat(datetime): add MinuteUDF for JVM-side minute extraction [skip ci]
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feat(datetime): add SecondUDF for JVM-side second extraction [skip ci]
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feat(datetime): route Hour through JVM UDF when engine=java [skip ci]
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feat(datetime): route Minute through JVM UDF when engine=java [skip ci]
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feat(datetime): route Second through JVM UDF when engine=java [skip ci]
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test(datetime): cover DST fall-back boundary in JVM UDF path [skip ci]
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test(datetime): assert default engine remains rust [skip ci]
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docs(datetime): document spark.comet.exec.datetime.engine [skip ci]
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fix(datetime): reject non-timestamp inputs explicitly when engine=java
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