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From "Ted Dunning (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DRILL-4754) Missing values are not missing
Date Mon, 27 Jun 2016 04:01:52 GMT

     [ https://issues.apache.org/jira/browse/DRILL-4754?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ted Dunning updated DRILL-4754:
-------------------------------
    Description: 
If I have a query which reads from a JSON file where a field is a list or is missing, then
the records where the field should missing will instead have a value for that field that is
an empty list:
{{
0: jdbc:drill:> select * from maprfs.ted.`bug.json`;
+----+--------+------+
| *a*  |   b    |  c   |
| 3  | [3,2]  | xyz  |
| 7  | []     | wxy  |
| 7  | []     | null  |
+----+--------+------+
2 rows selected (1.279 seconds)
}}
where the file in question contains these two records:
{{
{'a':3, 'b':[3,2], 'c':'xyz'}
{'a':7, 'c':'wxy'}
{"a":7, "b":[]}
}}
The problem is in the second record of the result. I would have expected b to have had the
value NULL.

I am using drill-1.6.0.




  was:
If I have a query which reads from a JSON file where a field is a list or is missing, then
the records where the field should missing will instead have a value for that field that is
an empty list:
<verbatim>
0: jdbc:drill:> select * from maprfs.ted.`bug.json`;
+----+--------+------+
| a  |   b    |  c   |
+----+--------+------+
| 3  | [3,2]  | xyz  |
| 7  | []     | wxy  |
+----+--------+------+
2 rows selected (1.279 seconds)
</verbatim>
where the file in question contains these two records:
<verbatim>
{'a':3, 'b':[3,2], 'c':'xyz'}
{'a':7, 'c':'wxy'}
</verbatim>
The problem is in the second record of the result. I would have expected b to have had the
value NULL.

I am using drill-1.6.0.





> Missing values are not missing
> ------------------------------
>
>                 Key: DRILL-4754
>                 URL: https://issues.apache.org/jira/browse/DRILL-4754
>             Project: Apache Drill
>          Issue Type: Bug
>            Reporter: Ted Dunning
>
> If I have a query which reads from a JSON file where a field is a list or is missing,
then the records where the field should missing will instead have a value for that field that
is an empty list:
> {{
> 0: jdbc:drill:> select * from maprfs.ted.`bug.json`;
> +----+--------+------+
> | *a*  |   b    |  c   |
> | 3  | [3,2]  | xyz  |
> | 7  | []     | wxy  |
> | 7  | []     | null  |
> +----+--------+------+
> 2 rows selected (1.279 seconds)
> }}
> where the file in question contains these two records:
> {{
> {'a':3, 'b':[3,2], 'c':'xyz'}
> {'a':7, 'c':'wxy'}
> {"a":7, "b":[]}
> }}
> The problem is in the second record of the result. I would have expected b to have had
the value NULL.
> I am using drill-1.6.0.



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