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[jira] [Created] (HIVE-19501) Fix HyperLogLog to be threadsafe

Zoltan Haindrich created HIVE-19501:

             Summary: Fix HyperLogLog to be threadsafe
                 Key: HIVE-19501
             Project: Hive
          Issue Type: Bug
            Reporter: Zoltan Haindrich

not sure if this is an issue in reality or not; but there are 3 static fields in HyperLogLog which are rewritten during working; if there are multiple threads are calculating HLL in the same JVM, there is a theoretical chance that they might overwrite eachothers value...

static fields:


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