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From "Rahul Challapalli (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DRILL-1887) SQL Standard : NULL values are not considered equal. But drill treats them as equal
Date Thu, 18 Dec 2014 16:02:13 GMT
Rahul Challapalli created DRILL-1887:
----------------------------------------

             Summary: SQL Standard : NULL values are not considered equal. But drill treats
them as equal
                 Key: DRILL-1887
                 URL: https://issues.apache.org/jira/browse/DRILL-1887
             Project: Apache Drill
          Issue Type: Bug
            Reporter: Rahul Challapalli


git.commit.id.abbrev=9dfa4a1

Dataset1:
{code}
{
 "col1":1,
 "col2":"abc"
}
{
 "col1":2,
 "col2":null
}
{code}

Dataset 2:
{code}
{
 "col1":1,
 "col2":null
}
{
 "col1":2,
 "col2":null
}
{
 "col1":2,
 "col2":"abc"
}
{code}

Query :
{code}
select * from `a.json` a join `b.json` b on a.col2=b.col2; 
+------------+------------+------------+------------+
|    col1    |    col2    |   col10    |   col20    |
+------------+------------+------------+------------+
| 1          | abc        | 2          | abc        |
| 2          | null       | 1          | null       |
| 2          | null       | 2          | null       |
+------------+------------+------------+------------+
{code}

Most database engines treat 2 NULL values as not being equal. This makes it hard to compare
DRILL's results against any Standard SQL engine. However I am not sure whether drill is intentionally
designed to behave this way.



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