[jira] [Created] (HIVE-22591) Make single metastore call to fetch all column stats instead of separate call for each column

[Vineet Garg (Jira)]

Vineet Garg created HIVE-22591:
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             Summary: Make single metastore call to fetch all column stats 
instead of separate call for each column
                 Key: HIVE-22591
                 URL: https://issues.apache.org/jira/browse/HIVE-22591
             Project: Hive
          Issue Type: Improvement
          Components: Query Planning
            Reporter: Vineet Garg
            Assignee: Vineet Garg


Currently HiveRelFieldTrimmer has the ability to fetch (and trigger cache) 
column stats in single call. 
HiveReduceExpressionsWithStatsRule on the other hand has to use column stats on 
demand, as a result it makes single call for each column.
This should be moved after RelFieldTrimmer so that RelFieldTrimmer has all the 
column stats cached.



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