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Posted to dev@drill.apache.org by "Rahul Challapalli (JIRA)" <ji...@apache.org> on 2014/12/18 17:02:13 UTC
[jira] [Created] (DRILL-1887) SQL Standard : NULL values are not
considered equal. But drill treats them as equal
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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