[jira] [Assigned] (DRILL-3476) Filter on nested element gives wrong results

["Steven Phillips (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/DRILL-3476?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steven Phillips reassigned DRILL-3476:
--------------------------------------

    Assignee: Steven Phillips

> Filter on nested element gives wrong results
> --------------------------------------------
>
>                 Key: DRILL-3476
>                 URL: https://issues.apache.org/jira/browse/DRILL-3476
>             Project: Apache Drill
>          Issue Type: Bug
>            Reporter: Steven Phillips
>            Assignee: Steven Phillips
>
> Take this query for example:
> {code}
> 0: jdbc:drill:drillbit=localhost> select * from t;
> +----------------+
> |       a        |
> +----------------+
> | {"b":1,"c":1}  |
> +----------------+
> {code}
> if I instead run:
> {code}
> 0: jdbc:drill:drillbit=localhost> select a from t where t.a.b = 1;
> +----------------+
> |       a        |
> +----------------+
> | {"b":1}  |
> +----------------+
> {code}
> Only a.b was returned, but the select specified a. In this case, it should have returned all of the elements of a, not just the one specified in the filter.
> This is because the logic in FieldSelection does not correctly handle the case where a selected column is a child of another selected column. In such a case, the record reader should ignore the child column, and just return the full selected parent column.



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