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  1. Apache Drill
  2. DRILL-5845

Columns returned by select with "ORDER BY" and "LIMIT" clauses are not in correct order.

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      Description

      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:

      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)
      

      For json files the column ordering is not preserved as well:

      select * from cp.`employee.json` limit 1;
      select * from cp.`employee.json` order by full_name limit 1;
      

      Perhaps the wrong operator for sorting is used.

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              • Assignee:
                vitalii Vitalii Diravka
                Reporter:
                vitalii Vitalii Diravka
                Reviewer:
                Arina Ielchiieva
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                • Created:
                  Updated:
                  Resolved: