rednaxelafx opened a new pull request #24352: [SPARK-27199][SQL][FOLLOWUP] Fix bug in codegen templates in UnixTime and FromUnixTime URL: https://github.com/apache/spark/pull/24352 ## What changes were proposed in this pull request? SPARK-27199 introduced the use of `ZoneId` instead of `TimeZone` in a few date/time expressions. There were 3 occurrences of `ctx.addReferenceObj("zoneId", zoneId)` in that PR, which had a bug because while the `java.time.ZoneId` base type is public, the actual concrete implementation classes are not public, so using the 2-arg version of `CodegenContext.addReferenceObj` would incorrectly generate code that reference non-public types (`java.time.ZoneRegion`, to be specific). The 3-arg version should be used, with the class name of the referenced object explicitly specified to the public base type. One of such occurrences was caught in testing in the main PR of SPARK-27199, for `DateFormatClass`. But the other 2 occurrences slipped through because there were no test cases that covered them. This PR fixes the codegen issues and adds the corresponding unit tests. ## How was this patch tested? Enhanced tests in `DateExpressionsSuite` for `to_unix_timestamp` and `from_unixtime`.
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