Khurram Faraaz created DRILL-4852:
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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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