MaxGekk opened a new pull request #28127: [SPARK-31353][SQL] Set a time zone in DateTimeBenchmark and DateTimeRebaseBenchmark URL: https://github.com/apache/spark/pull/28127 ### What changes were proposed in this pull request? In the PR, I propose to set the `America/Los_Angeles` time zone in the date-time benchmarks `DateTimeBenchmark` and `DateTimeRebaseBenchmark` via `withDefaultTimeZone(LA)` and `withSQLConf(SQLConf.SESSION_LOCAL_TIMEZONE.key -> LA.getId)`. The results of affected benchmarks was given on an Amazon EC2 instance w/ the configuration: | Item | Description | | ---- | ----| | Region | us-west-2 (Oregon) | | Instance | r3.xlarge | | AMI | ubuntu/images/hvm-ssd/ubuntu-bionic-18.04-amd64-server-20190722.1 (ami-06f2f779464715dc5) | | Java | OpenJDK8/11 | ### Why are the changes needed? Performance of date-time functions can depend on the system JVM time zone or SQL config `spark.sql.session.timeZone`. The changes allow to avoid any fluctuations of benchmarks results related to time zones, and set a reliable baseline for future optimization. ### Does this PR introduce any user-facing change? No ### How was this patch tested? By regenerating results of DateTimeBenchmark and DateTimeRebaseBenchmark.
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