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From "Chun Chang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DRILL-1945) max() of all 0.0 value gives wrong results
Date Wed, 07 Jan 2015 01:21:34 GMT
Chun Chang created DRILL-1945:
---------------------------------

             Summary: max() of all 0.0 value gives wrong results
                 Key: DRILL-1945
                 URL: https://issues.apache.org/jira/browse/DRILL-1945
             Project: Apache Drill
          Issue Type: Bug
          Components: Functions - Drill
    Affects Versions: 0.8.0
            Reporter: Chun Chang
            Assignee: Aman Sinha


#Fri Jan 02 21:20:47 EST 2015
git.commit.id.abbrev=b491cdb

test data can be accessed from  https://s3.amazonaws.com/apache-drill/files/complex.json.gz

Using the above dataset, the t.sfa[0] field is all 0.0.

{code}
0: jdbc:drill:schema=dfs.drillTestDirMondrian> select t.sfa[0] from `complex.json` t limit
10;
+------------+
|   EXPR$0   |
+------------+
| 0.0        |
| 0.0        |
| 0.0        |
| 0.0        |
| 0.0        |
| 0.0        |
| 0.0        |
| 0.0        |
| 0.0        |
| 0.0        |
+------------+
10 rows selected (0.083 seconds)
0: jdbc:drill:schema=dfs.drillTestDirMondrian> select t.sfa[0] from `complex.json` t where
t.sfa[0] <> 0.0;
+------------+
|   EXPR$0   |
+------------+
+------------+
No rows selected (15.616 seconds)
{code}

The max value of this field in a group by query gives wrong results.

{code}
0: jdbc:drill:schema=dfs.drillTestDirMondrian> select mod(trunc(t.sfa[1]), 10) sfamod,
max(t.sfa[0]) sfamax from `complex.json` t group by mod(trunc(t.sfa[1]), 10);
+------------+------------+
|   sfamod   |   sfamax   |
+------------+------------+
| 1.0        | 4.9E-324   |
| 2.0        | 4.9E-324   |
| 3.0        | 4.9E-324   |
| 4.0        | 4.9E-324   |
| 5.0        | 4.9E-324   |
| 6.0        | 4.9E-324   |
| 7.0        | 4.9E-324   |
| 8.0        | 4.9E-324   |
| 9.0        | 4.9E-324   |
| 0.0        | 4.9E-324   |
+------------+------------+
10 rows selected (14.474 seconds)
{code}

simple max() on the field also gives the same wrong result.

{code}
0: jdbc:drill:schema=dfs.drillTestDirMondrian> select max(t.sfa[0]) sfamax from `complex.json`
t;
+------------+
|   sfamax   |
+------------+
| 4.9E-324   |
+------------+
1 row selected (15.666 seconds)
{code}



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