bd2019us opened a new pull request #621: Change Math.random to 
Random.nextDouble for lower performance overhead
URL: https://github.com/apache/hive/pull/621
 
 
   [HIVE-21719](https://issues.apache.org/jira/browse/HIVE-21719)
   
   Some performance can be saved by using Random.nextDouble instead of 
Math.random. Furthermore, the Random class is highly configurable if random 
configuration is needed in future developments.

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