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Posted to issues@drill.apache.org by "Rahul Challapalli (JIRA)" <ji...@apache.org> on 2015/01/20 20:47:34 UTC
[jira] [Updated] (DRILL-2046) Merge join inconsistent results
[ https://issues.apache.org/jira/browse/DRILL-2046?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Rahul Challapalli updated DRILL-2046:
-------------------------------------
Attachment: widestrings_small.parquet
This could be related to DRILL-2010 . However from the surface it looks different
> Merge join inconsistent results
> -------------------------------
>
> Key: DRILL-2046
> URL: https://issues.apache.org/jira/browse/DRILL-2046
> Project: Apache Drill
> Issue Type: Bug
> Components: Execution - Operators
> Reporter: Rahul Challapalli
> Assignee: Aman Sinha
> Priority: Critical
> Attachments: widestrings_small.parquet
>
>
> git.commit.id.abbrev=a418af1
> The below queries should result in the same no of records. However the counts do not match when we use merge join.
> {code}
> alter session set `planner.enable_hashjoin` = false;
> select ws1.* from widestrings_small ws1 INNER JOIN widestrings_small ws2 on ws1.str_fixed_null_empty=ws2.str_var_null_empty where ws1.str_fixed_null_empty is not null and ws2.str_var_null_empty is not null and ws1.tinyint_var > 120;
> 6 records
> select count(*) from widestrings_small ws1 INNER JOIN widestrings_small ws2 on ws1.str_fixed_null_empty=ws2.str_var_null_empty where ws1.str_fixed_null_empty is not null and ws2.str_var_null_empty is not null and ws1.tinyint_var > 120;
> 60 records
> select count(ws1.str_var) from widestrings_small ws1 INNER JOIN widestrings_small ws2 on ws1.str_fixed_null_empty=ws2.str_var_null_empty where ws1.str_fixed_null_empty is not null and ws2.str_var_null_empty is not null and ws1.tinyint_var > 120;
> 4 records
> {code}
> For hash join all the above queries result in 60 records. I attached the dataset used. Let me know if you have any questions.
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