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  1. MariaDB ColumnStore
  2. MCOL-2146

group_concat with distinct concatenates even non-distinct values

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Details

    • Bug
    • Status: Closed (View Workflow)
    • Minor
    • Resolution: Fixed
    • 1.0.15, 1.1.6, 1.2.2
    • 1.4.0
    • ExeMgr
    • None
    • 2019-06

    Description

      If the group_concat contains distinct together with sorting over non-distinct column CS concatenates distinct values multiple times.

      Here is the setting:

      create table cs1 (i bigint, a bigint) engine=columnstore;
      		 
      insert into cs1 values (1,2),(1,3),(2,5),(1,42);


      MariaDB [tpch1]> select group_concat(distinct i order by a) s from cs1;
      		 
      +---------+
      		 
      | s       |
      		 
      +---------+
      		 
      | 1,1,2,1 |
      		 
      +---------+
      		 
      1 row in set (0.031 sec)

      Attachments

        Issue Links

          is duplicated by

          Sub-Task - The sub-task of the issue MCOL-2159 Fix group_concat

          • Major - Major loss of function.
          • Closed

          Sub-Task - The sub-task of the issue MCOL-3805 CLONE - Fix group_concat

          • Major - Major loss of function.
          • Closed
          relates to

          Bug - A problem which impairs or prevents the functions of the product. MCOL-1829 Output of 'select * (with order by limit) queries' returns unexpected result

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed

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              dleeyh Daniel Lee
              drrtuy Roman
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              Dates

                Created:
                Updated:
                Resolved:

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