asterix-app/src/test/resources/optimizerts/results/union/query-ASTERIXDB-1205-4.plan

-- DISTRIBUTE_RESULT  |UNPARTITIONED|
  -- ONE_TO_ONE_EXCHANGE  |UNPARTITIONED|
    -- STREAM_PROJECT  |UNPARTITIONED|
      -- ONE_TO_ONE_EXCHANGE  |UNPARTITIONED|
        -- STABLE_SORT [$$28(ASC), $$29(ASC)]  |UNPARTITIONED|
          -- ONE_TO_ONE_EXCHANGE  |UNPARTITIONED|
            -- UNION_ALL  |UNPARTITIONED|
              -- ONE_TO_ONE_EXCHANGE  |UNPARTITIONED|
                -- UNION_ALL  |UNPARTITIONED|
                  -- ONE_TO_ONE_EXCHANGE  |UNPARTITIONED|
                    -- ASSIGN  |UNPARTITIONED|
                      -- STREAM_PROJECT  |UNPARTITIONED|
                        -- UNNEST  |UNPARTITIONED|
                          -- ASSIGN  |UNPARTITIONED|
                            -- EMPTY_TUPLE_SOURCE  |UNPARTITIONED|
                  -- ONE_TO_ONE_EXCHANGE  |UNPARTITIONED|
                    -- ASSIGN  |UNPARTITIONED|
                      -- STREAM_PROJECT  |UNPARTITIONED|
                        -- UNNEST  |UNPARTITIONED|
                          -- ASSIGN  |UNPARTITIONED|
                            -- EMPTY_TUPLE_SOURCE  |UNPARTITIONED|
              -- ONE_TO_ONE_EXCHANGE  |UNPARTITIONED|
                -- ASSIGN  |UNPARTITIONED|
                  -- STREAM_PROJECT  |UNPARTITIONED|
                    -- UNNEST  |UNPARTITIONED|
                      -- ASSIGN  |UNPARTITIONED|
                        -- EMPTY_TUPLE_SOURCE  |UNPARTITIONED|