[jira] [Commented] (DRILL-5845) Columns returned by select with "ORDER BY" and "LIMIT" clauses are not in correct order.

["Robert Hou (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DRILL-5845?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16275800#comment-16275800 ] 

Robert Hou commented on DRILL-5845:
-----------------------------------

This issue also occurs when dir0/dir1/dir2 are used, even if there is no "order by" or "limit" clauses.  Dir0/dir1/dir2 now appear as the first few columns.

> Columns returned by select with "ORDER BY" and "LIMIT" clauses are not in correct order.
> ----------------------------------------------------------------------------------------
>
>                 Key: DRILL-5845
>                 URL: https://issues.apache.org/jira/browse/DRILL-5845
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Query Planning & Optimization
>    Affects Versions: 1.11.0
>            Reporter: Vitalii Diravka
>            Assignee: Vitalii Diravka
>              Labels: ready-to-commit
>             Fix For: 1.12.0
>
>
> Column order is proper for queries with only one clause: ORDER BY or LIMIT. For queries with both these clauses column order isn't preserved.
> Test case for reproduce:
> {code}
> 0: jdbc:drill:zk=local> select * from cp.`tpch/nation.parquet` limit 1;
> +--------------+----------+--------------+------------------------------------------------------+
> | n_nationkey  |  n_name  | n_regionkey  |                      n_comment                       |
> +--------------+----------+--------------+------------------------------------------------------+
> | 0            | ALGERIA  | 0            |  haggle. carefully final deposits detect slyly agai  |
> +--------------+----------+--------------+------------------------------------------------------+
> 1 row selected (0.181 seconds)
> 0: jdbc:drill:zk=local> select * from cp.`tpch/nation.parquet` order by n_name limit 1;
> +------------------------------------------------------+----------+--------------+--------------+
> |                      n_comment                       |  n_name  | n_nationkey  | n_regionkey  |
> +------------------------------------------------------+----------+--------------+--------------+
> |  haggle. carefully final deposits detect slyly agai  | ALGERIA  | 0            | 0            |
> +------------------------------------------------------+----------+--------------+--------------+
> 1 row selected (0.154 seconds)
> {code}
> For json files the column ordering is not preserved as well:
> {code}
> select * from cp.`employee.json` limit 1;
> select * from cp.`employee.json` order by full_name limit 1;
> {code}
> Perhaps the wrong operator for sorting is used.



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