[jira] [Created] (DRILL-4852) COUNT(*) query over 26M rows slower by 2x on mapr drill 1.8.0

["Khurram Faraaz (JIRA)" <ji...@apache.org>]

Khurram Faraaz created DRILL-4852:
-------------------------------------

             Summary: COUNT(*) query over 26M rows slower by 2x on mapr drill 1.8.0
                 Key: DRILL-4852
                 URL: https://issues.apache.org/jira/browse/DRILL-4852
             Project: Apache Drill
          Issue Type: Bug
          Components: Execution - Flow
    Affects Versions: 1.8.0
         Environment: 4 node cluster CentOS
            Reporter: Khurram Faraaz
            Priority: Critical


We have this manual test where it does a COUNT over 26 million JSON keys. From the results it looks like we have regressed and are slower by 2x on current 1.8.0 master 1.8.0-SNAPSHOT git commit ID : 57dc9f43
Query takes over 30 seconds to execute consistently over several runs. Note that since this is a single large JSON file there is just one fragment doing all the work.

{noformat}
0: jdbc:drill:schema=dfs.tmp> select count(*) from `twoKeyJsn.json`;
+-----------+
|  EXPR$0   |
+-----------+
| 26212355  |
+-----------+
1 row selected (29.001 seconds)
{noformat}

On Drill 1.2.0 the above query took 13.949 seconds





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