MaxGekk opened a new pull request #27999: [SPARK-31232][SQL][DOCS] Specify formats of `spark.sql.session.timeZone` URL: https://github.com/apache/spark/pull/27999 ### What changes were proposed in this pull request? In the PR, I propose to update the doc for `spark.sql.session.timeZone`, and restrict format of config's values to 2 forms: 1. Geographical regions, such as `America/Los_Angeles`. 2. Fixed offsets - a fully resolved offset from UTC. For example, `-08:00`. ### Why are the changes needed? Other formats such as three-letter time zone IDs are ambitious, and depend on the locale. For example, `CST` could be U.S. `Central Standard Time` and `China Standard Time`. Such formats have been already deprecated in JDK, see [Three-letter time zone IDs](https://docs.oracle.com/javase/8/docs/api/java/util/TimeZone.html). ### Does this PR introduce any user-facing change? No ### How was this patch tested? By running `./dev/scalastyle`, and manual testing.
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