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https://issues.apache.org/jira/browse/DRILL-5201?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15829565#comment-15829565
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mehran edited comment on DRILL-5201 at 1/19/17 9:38 AM:
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I added sample data and query is updated to:
SELECT event_source_id FROM dfs.root.`/repositories/01/2017/01/16/20`
Tlb0 where event_source_id = 2000163 LIMIT 100 OFFSET 0
This query returns null values.
Besides query result is null. I do not know if this issue is related to null
value or not but the problem is as follows:
This query has a count of 2 for null values :
SELECT event_source_id, count(*) FROM
dfs.root.`/repositories/01/2017/01/16/20` Tlb0 WHERE event_source_id IS NULL
GROUP BY event_source_id LIMIT 100 OFFSET 0
Another query that I remove where condition has 30 results for null values:
SELECT event_source_id, count(*) FROM
dfs.root.`/repositories/01/2017/01/16/20` Tlb0 GROUP BY event_source_id LIMIT
100 OFFSET 0
These two queries has different count for null values;
Thank you for your attention
was (Author: mehran):
I added sample data and query is updated to:
SELECT event_source_id FROM dfs.root.`/repositories/01/2017/01/16/20`
Tlb0 where event_source_id = 2000163 LIMIT 100 OFFSET 0
> Query bug: null values in result of a conditioned query
> ---------------------------------------------------------
>
> Key: DRILL-5201
> URL: https://issues.apache.org/jira/browse/DRILL-5201
> Project: Apache Drill
> Issue Type: Bug
> Components: Client - HTTP
> Affects Versions: 1.9.0
> Reporter: mehran
> Attachments: 20.tar.gz
>
>
> I have a table with 300 columns.
> When I select a query , some null columns are also returned.
> This is the query that I used.
> "select a,b from dfs.root.`/2016/1/17` where a=1"
> For example in this query some columns are returned that "a" value is null.
> I think null values are problems. Because when I add a condition to it like
> "select a,b from dfs.root.`/2016/1/17` where a=1 and a IS NOT NULL"
> there is not any change and still NULL values are returned.
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