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Posted to issues@drill.apache.org by "Chris Westin (JIRA)" <ji...@apache.org> on 2015/04/15 22:34:58 UTC
[jira] [Updated] (DRILL-2264) Incorrect data when we use aggregate
functions with flatten
[ https://issues.apache.org/jira/browse/DRILL-2264?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Chris Westin updated DRILL-2264:
--------------------------------
Fix Version/s: (was: 0.9.0)
1.0.0
> Incorrect data when we use aggregate functions with flatten
> -----------------------------------------------------------
>
> Key: DRILL-2264
> URL: https://issues.apache.org/jira/browse/DRILL-2264
> Project: Apache Drill
> Issue Type: Bug
> Components: Execution - Relational Operators
> Reporter: Rahul Challapalli
> Assignee: Jason Altekruse
> Priority: Critical
> Fix For: 1.0.0
>
>
> git.commit.id.abbrev=6676f2d
> Data Set :
> {code}
> {
> "uid":1,
> "lst_lst" : [[1,2],[3,4]]
> }
> {
> "uid":2,
> "lst_lst" : [[1,2],[3,4]]
> }
> {code}
> The below query returns incorrect results :
> {code}
> select uid,MAX( flatten(lst_lst[1]) + flatten(lst_lst[0])) from `temp.json` group by uid, flatten(lst_lst[1]), flatten(lst_lst[0]);
> +------------+------------+
> | uid | EXPR$1 |
> +------------+------------+
> | 1 | 6 |
> | 1 | 6 |
> | 1 | 6 |
> | 1 | 6 |
> | 2 | 6 |
> | 2 | 6 |
> | 2 | 6 |
> | 2 | 6 |
> +------------+------------+
> {code}
> However if we use a sub query, drill returns the right data
> {code}
> select uid, MAX(l1+l2) from (select uid,flatten(lst_lst[1]) l1, flatten(lst_lst[0]) l2 from `temp.json`) sub group by uid, l1, l2;
> +------------+------------+
> | uid | EXPR$1 |
> +------------+------------+
> | 1 | 4 |
> | 1 | 5 |
> | 1 | 5 |
> | 1 | 6 |
> | 2 | 4 |
> | 2 | 5 |
> | 2 | 5 |
> | 2 | 6 |
> +------------+------------+
> {code}
> Also using a single flatten yields proper results
> {code}
> select uid,MAX(flatten(lst_lst[0])) from `temp.json` group by uid, flatten(lst_lst[0]);
> +------------+------------+
> | uid | EXPR$1 |
> +------------+------------+
> | 1 | 1 |
> | 1 | 2 |
> | 2 | 1 |
> | 2 | 2 |
> +------------+------------+
> {code}
> Marked it as critical since we return in-correct data. Let me know if you have any other questions
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