[GitHub] spark pull request: [SPARK-13100] [SQL] improving the performance ...

[carsonwang <gi...@git.apache.org>]

Github user carsonwang commented on the pull request:

    https://github.com/apache/spark/pull/10994#issuecomment-179567757
  
    I think we should also reusing a Calendar object in each thread. It is expensive to create java Calendar and Timezone objects each time the method is called. I noticed the same problem and I saw performance boost if reusing these objects. The duration of one stage was improved from 1.6 minutes to 1.2 minutes. @wangyang1992 @rxin 


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