Takuya UESHIN c8c878a416 [SPARK-20588][SQL] Cache TimeZone instances. ... ## What changes were proposed in this pull request? Because the method `TimeZone.getTimeZone(String ID)` is synchronized on the TimeZone class, concurrent call of this method will become a bottleneck. This especially happens when casting from string value containing timezone info to timestamp value, which uses `DateTimeUtils.stringToTimestamp()` and gets TimeZone instance on the site. This pr makes a cache of the generated TimeZone instances to avoid the synchronization. ## How was this patch tested? Existing tests. Author: Takuya UESHIN <ueshin@databricks.com> Closes #17933 from ueshin/issues/SPARK-20588.		2017-05-15 16:52:22 -07:00
..
src	[SPARK-20588][SQL] Cache TimeZone instances.	2017-05-15 16:52:22 -07:00
pom.xml	[SPARK-20453] Bump master branch version to 2.3.0-SNAPSHOT	2017-04-24 21:48:04 -07:00