[jira] [Commented] (DRILL-2869) Incorrect data when we have fields missing in some of the files - another case

["Rahul Challapalli (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DRILL-2869?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14511396#comment-14511396 ] 

Rahul Challapalli commented on DRILL-2869:
------------------------------------------

The fix for DRILL-2868 and this could be the same. However they manifest as different problems.

> Incorrect data when we have fields missing in some of the files - another case
> ------------------------------------------------------------------------------
>
>                 Key: DRILL-2869
>                 URL: https://issues.apache.org/jira/browse/DRILL-2869
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Execution - Relational Operators, Storage - JSON, Storage - Parquet
>            Reporter: Rahul Challapalli
>            Assignee: Hanifi Gunes
>            Priority: Critical
>
> git.commit.id.abbrev=5cd36c5
> Data File1 : a.json
> {code}
> { "c1" : 1, "m1" : {"m2" : {"m3" : {"c2" : 5} } } }
> { "c1" : 2, "m1" : {"m2" : {"m3" : {"c2" : 6} } } }
> { "c1" : 3, "m1" : {"m2" : {"c2" : 5} } }
> {code}
> Data File2 : b.json
> {code}
> { "c1" : 3, "m1" : {"m2" : {"c2" : 5} } }
> { "c1" : 3, "m1" : {"m2" : {"c2" : 5} } }
> { "c1" : 3, "m1" : {"m2" : {"c2" : 5} } }
> {code}
> Data File3 : c.json
> {code}
> { "c1" : 3, "m1" : {"m2" : {"c2" : 5} } }
> { "c1" : 3, "m1" : {"m2" : {"c2" : 5} } }
> { "c1" : 3, "m1" : {"m2" : {"c2" : 5} } }
> {code}
> The below query reports incorrect results for both json and parquet formats. It returns empty maps when it should not. This issue is even present when we query equivalent parquet files
> {code}
> select t.m1.m2 from `delme_repro` as `t`;
> +------------+
> |   EXPR$0   |
> +------------+
> | {"c2":5}   |
> | {"c2":5}   |
> | {"c2":5}   |
> | {"c2":5}   |
> | {"c2":5}   |
> | {"c2":5}   |
> | {}         |
> | {}         |
> | {"c2":5}   |
> +------------+
> {code}
> However if I run the same query on the specific file, I get the correct output
> {code}
> select t.m1.m2 from `delme_repro/a.json` as `t`;
> +------------+
> |   EXPR$0   |
> +------------+
> | {"m3":{"c2":5}} |
> | {"m3":{"c2":6}} |
> | {"m3":{},"c2":5} |
> +------------+
> 3 rows selected (0.113 seconds)
> {code}
> Let me know if you have any questions



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