Uploaded image for project: 'Calcite'
  1. Calcite
  2. CALCITE-4063

Unnest an array of single-item structs causes ClassCastException

VotersWatch issueWatchersLinkCloneUpdate Comment AuthorReplace String in CommentUpdate Comment VisibilityDelete Comments
    XMLWordPrintableJSON

Details

    Description

      If we run the following queries with UNNEST operator, we get the expected results:

      select * from UNNEST(array[3, 4]) as T2(y);
      -- y=3
      -- y=4
      
      select * from UNNEST(array[array[3], array[4]]) as T2(y)
      -- y=[3]
      -- y=[4]
      
      select * from UNNEST(array[ROW(3), ROW(4)]) as T2(y)
      -- y=[3]
      -- y=[4]
      -- Is this result ok? (see first comment of the current ticket)
      

      However, if we try to combine them with a correlation with some other values, as we could do in more realistic examples:
      select * from dept_nested as d, UNNEST(d.employees) e2

      The first two return the expected results, but the last one throws an exception:

      select * from (values (1), (2)) T1(x), UNNEST(array[3, 4]) as T2(y);
      -- x=1; y=3
      -- x=1; y=4
      -- x=2; y=3
      -- x=2; y=4
      
      select * from (values (1), (2)) T1(x), UNNEST(array[array[3], array[4]]) as T2(y);
      -- x=1; y=[3]
      -- x=1; y=[4]
      -- x=2; y=[3]
      -- x=2; y=[4]
      
      select * from (values (1), (2)) T1(x), UNNEST(array[ROW(3), ROW(4)]) as T2(y);
      -- ERROR!!!
      -- java.lang.ClassCastException: org.apache.calcite.runtime.FlatLists$Flat1List cannot be cast to java.lang.Integer
      

      Attachments

        Issue Links

        Activity

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

          People

            rubenql Ruben Q L
            rubenql Ruben Q L
            Votes:
            0 Vote for this issue
            Watchers:
            4 Start watching this issue

            Dates

              Created:
              Updated:
              Resolved:

              Time Tracking

                Estimated:
                Original Estimate - Not Specified
                Not Specified
                Remaining:
                Remaining Estimate - 0h
                0h
                Logged:
                Time Spent - 1h 50m
                1h 50m

                Slack

                  Issue deployment