Uploaded image for project: 'Apache Drill'
  1. Apache Drill
  2. DRILL-3476

Filter on nested element gives wrong results

VotersWatch issueWatchersLinkCloneUpdate Comment AuthorReplace String in CommentUpdate Comment VisibilityDelete Comments
    XMLWordPrintableJSON

Details

    • Bug
    • Status: Closed
    • Critical
    • Resolution: Fixed
    • None
    • 1.2.0
    • None
    • 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.

      Attachments

        Issue Links

        Activity

          This comment will be Viewable by All Users Viewable by All Users
          Cancel

          People

            cchang@maprtech.com Chun Chang
            sphillips Steven Phillips
            Votes:
            0 Vote for this issue
            Watchers:
            4 Start watching this issue

            Dates

              Created:
              Updated:
              Resolved:

              Slack

                Issue deployment