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https://issues.apache.org/jira/browse/DRILL-3476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14640611#comment-14640611
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ASF GitHub Bot commented on DRILL-3476:
---------------------------------------
Github user hnfgns commented on the pull request:
https://github.com/apache/drill/pull/83#issuecomment-124561596
+1
> 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
> Priority: Critical
> Fix For: 1.2.0
>
>
> 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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