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  1. Apache Drill
  2. DRILL-3476

Filter on nested element gives wrong results

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Critical
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 1.2.0
    • Component/s: None
    • Labels:
      None

      Description

      Take this query for example:

      0: jdbc:drill:drillbit=localhost> select * from t;
      +----------------+
      |       a        |
      +----------------+
      | {"b":1,"c":1}  |
      +----------------+
      

      if I instead run:

      0: jdbc:drill:drillbit=localhost> select a from t where t.a.b = 1;
      +----------------+
      |       a        |
      +----------------+
      | {"b":1}  |
      +----------------+
      

      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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              • Assignee:
                cchang@maprtech.com Chun Chang
                Reporter:
                sphillips Steven Phillips
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                • Created:
                  Updated:
                  Resolved: