GitHub user ssonker opened a pull request:
https://github.com/apache/spark/pull/21505
[SPARK-24457][SQL] Improving performance of stringToTimestamp by cachâ¦
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
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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
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