[SPARK-31940][SQL][DOCS] Document the default JVM time zone in to/fromJavaDate and legacy date formatters #28767
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@cloud-fan @HyukjinKwon Please, review this PR. @juliuszsompolski After offline discussions, we decided to just document the current behaviour and keep the legacy formatters dependent on the default JVM time zone (and ignore Spark's session time zone). |
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Test build #123684 has finished for PR 28767 at commit
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thanks, merging to master/3.0! |
cloud-fan
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Jun 9, 2020
…mJavaDate and legacy date formatters ### What changes were proposed in this pull request? Update comments for `DateTimeUtils`.`toJavaDate` and `fromJavaDate`, and for the legacy date formatters `LegacySimpleDateFormatter` and `LegacyFastDateFormatter` regarding to the default JVM time zone. The comments say that the default JVM time zone is used intentionally for backward compatibility with Spark 2.4 and earlier versions. Closes #28709 ### Why are the changes needed? To document current behaviour of related methods in `DateTimeUtils` and the legacy date formatters. For example, correctness of `HiveResult.hiveResultString` and `toHiveString` is directly related to the same time zone used by `toJavaDate` and `LegacyFastDateFormatter`. ### Does this PR introduce _any_ user-facing change? No ### How was this patch tested? By running the Scala style checker `./dev/scalastyle` Closes #28767 from MaxGekk/doc-legacy-formatters. Authored-by: Max Gekk <[email protected]> Signed-off-by: Wenchen Fan <[email protected]> (cherry picked from commit de91915) Signed-off-by: Wenchen Fan <[email protected]>
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What changes were proposed in this pull request?
Update comments for
DateTimeUtils.toJavaDateandfromJavaDate, and for the legacy date formattersLegacySimpleDateFormatterandLegacyFastDateFormatterregarding to the default JVM time zone. The comments say that the default JVM time zone is used intentionally for backward compatibility with Spark 2.4 and earlier versions.Closes #28709
Why are the changes needed?
To document current behaviour of related methods in
DateTimeUtilsand the legacy date formatters. For example, correctness ofHiveResult.hiveResultStringandtoHiveStringis directly related to the same time zone used bytoJavaDateandLegacyFastDateFormatter.Does this PR introduce any user-facing change?
No
How was this patch tested?
By running the Scala style checker
./dev/scalastyle