GitHub user ssonker opened a pull request: https://github.com/apache/spark/pull/21505
[SPARK-24457][SQL] Improving performance of stringToTimestamp by cach⦠â¦ing Calendar instances for input timezones instead of creating new everytime ## What changes were proposed in this pull request? As of now, stringToTimestamp function in DateTimeUtils creates a calendar instance on each call. This change maintains a thread-local timezone to calendar map, and creates just one calendar for each timezone. Whenever a calendar instance is queried given a timezone, it is looked-up inside the map, reinitialized and returned. ## How was this patch tested? Using existing test cases. Please review http://spark.apache.org/contributing.html before opening a pull request. You can merge this pull request into a Git repository by running: $ git pull https://github.com/ssonker/spark master Alternatively you can review and apply these changes as the patch at: https://github.com/apache/spark/pull/21505.patch To close this pull request, make a commit to your master/trunk branch with (at least) the following in the commit message: This closes #21505 ---- commit 84d5a911408411f327b620bb958b996e55264781 Author: Sharad Sonker <ssonker@...> Date: 2018-06-07T04:56:37Z [SPARK-24457][SQL] Improving performance of stringToTimestamp by caching Calendar instances for input timezones instead of creating new everytime ---- --- --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org