[GitHub] MaxGekk opened a new pull request #23812: [SPARK-26903][SQL] Remove the cache of TimeZones

[GitBox <gi...@apache.org>]

MaxGekk opened a new pull request #23812: [SPARK-26903][SQL] Remove the cache of TimeZones
URL: https://github.com/apache/spark/pull/23812
 
 
   ## What changes were proposed in this pull request?
   
   In the PR, I propose to convert time zone string to `TimeZone` by converting it to `ZoneId` which uses `ZoneOffset` internally. The `ZoneOffset` class of JDK 8 has a cache already: http://hg.openjdk.java.net/jdk8/jdk8/jdk/file/687fd7c7986d/src/share/classes/java/time/ZoneOffset.java#l205 . In this way, there is no need to support cache of time zones in Spark.
   
   The PR removes `computedTimeZones` from `DateTimeUtils`, and uses `ZoneId.of` to convert time zone id string to `ZoneId` and to `TimeZone` at the end.
   
   ## How was this patch tested?
   
   The changes were tested by 

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