[jira] [Created] (HIVE-19684) Hive stats optimizer wrongly uses stats against non native tables

["slim bouguerra (JIRA)" <ji...@apache.org>]

slim bouguerra created HIVE-19684:
-------------------------------------

             Summary: Hive stats optimizer wrongly uses stats against non native tables
                 Key: HIVE-19684
                 URL: https://issues.apache.org/jira/browse/HIVE-19684
             Project: Hive
          Issue Type: Bug
            Reporter: slim bouguerra
            Assignee: slim bouguerra


Stats of non native tables are inaccurate, thus queries over non native tables can not optimized by stats optimizer.
Take example of query 
{code}
Explain select count(*) from (select `__time` from druid_test_table limit 1) as src ;
{code} 

the plan will be reduced to 
{code}
POSTHOOK: query: explain extended select count(*) from (select `__time` from druid_test_table limit 1) as src
POSTHOOK: type: QUERY
STAGE DEPENDENCIES:
  Stage-0 is a root stage
STAGE PLANS:
  Stage: Stage-0
    Fetch Operator
      limit: 1
      Processor Tree:
        ListSink
{code}



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