[jira] [Created] (DRILL-1175) Add hash table occupancy statistics

["Aman Sinha (JIRA)" <ji...@apache.org>]

Aman Sinha created DRILL-1175:
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             Summary: Add  hash table occupancy statistics
                 Key: DRILL-1175
                 URL: https://issues.apache.org/jira/browse/DRILL-1175
             Project: Apache Drill
          Issue Type: Improvement
            Reporter: Aman Sinha
            Priority: Minor


For all the hash based operations, we currently collect a few run-time metrics such as number of buckets, number of entries, number of resizing attempts.  We should also collect the hash table occupancy statistics to allow better diagnosis of performance issues.  The occupancy stats should include  min, max and average length of a hash chain among all the buckets. 



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