MaxGekk opened a new pull request #25230: [SPARK-28471][SQL] Replace `yyyy` by `uuuu` in date-timestamp patterns without era URL: https://github.com/apache/spark/pull/25230 ## What changes were proposed in this pull request? In the PR, I propose to use `uuuu` for years instead of `yyyy` in date/timestamp patterns without the era pattern `G` (https://docs.oracle.com/javase/8/docs/api/java/time/format/DateTimeFormatter.html). **Parsing/formatting of positive years (current era) will be the same.** The difference is in formatting negative years belong to previous era - BC (Before Christ). Before the changes, the year of common era `100` and the year of BC era `-99`, showed similarly as `100`. After the changes negative years will be formatted with the `-` sign. Before: ```Scala scala> Seq(java.time.LocalDate.of(-99, 1, 1)).toDF().show +----------+ | value| +----------+ |0100-01-01| +----------+ ``` After: ```Scala scala> Seq(java.time.LocalDate.of(-99, 1, 1)).toDF().show +-----------+ | value| +-----------+ |-0099-01-01| +-----------+ ``` ## How was this patch tested? By existing test suites.
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