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  1. MariaDB ColumnStore
  2. MCOL-4612

A subquery with a union for DECIMAL and BIGINT returns zeros

Details

    • 2021-8

    Description

      The problem does not seem to be repeatable in 5.x.

      DROP TABLE IF EXISTS t1;
      		 
      CREATE TABLE t1 (a DECIMAL(17,1), b BIGINT) ENGINE=ColumnStore;
      		 
      INSERT INTO t1 VALUES (1, 1);
      		 
      INSERT INTO t1 VALUES (9999999999999999, 99999999999999999);
      		 
      SELECT * FROM (SELECT a FROM t1 UNION SELECT b FROM t1) tu;


      +------+
      		 
      | a    |
      		 
      +------+
      		 
      |  0.0 |
      		 
      |  0.0 |
      		 
      |  0.0 |
      		 
      +------+


      SELECT * FROM (SELECT a FROM t1 UNION ALL SELECT b FROM t1) tu;


      +------+
      		 
      | a    |
      		 
      +------+
      		 
      |  0.0 |
      		 
      |  0.0 |
      		 
      |  0.0 |
      		 
      |  0.0 |
      		 
      +------+

      Note, without the subquery it works as expected:

      SELECT a FROM t1 UNION SELECT b FROM t1;


      +---------------------+
      		 
      | a                   |
      		 
      +---------------------+
      		 
      |                 1.0 |
      		 
      |  9999999999999999.0 |
      		 
      | 99999999999999999.0 |
      		 
      +---------------------+


      SELECT a FROM t1 UNION ALL SELECT b FROM t1;


      +---------------------+
      		 
      | a                   |
      		 
      +---------------------+
      		 
      |                 1.0 |
      		 
      |  9999999999999999.0 |
      		 
      |                 1.0 |
      		 
      | 99999999999999999.0 |
      		 
      +---------------------+

      Attachments

        Issue Links

          blocks

          Bug - A problem which impairs or prevents the functions of the product. MCOL-4613 Garbage result of a union between huge narrow DECIMAL and BIGINT

          • Blocker - Blocks development and/or testing work, production could not run.
          • Closed
          relates to

          Task - A task that needs to be done. MCOL-4361 Replace pow(10.0, (double)scale) expressions with a static dictionary lookup.

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Closed

          New Feature - A new feature of the product, which has yet to be developed. MCOL-641 Full DECIMAL support in ColumnStore

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MCOL-4700 Wrong result of a UNION for INT and INT UNSIGNED

          • Major - Major loss of function.
          • Closed

          Activity

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            tntnatbry Gagan Goel (Inactive) added a comment -

            For QA: Queries to confirm the issue and verify the fix works are in the issue description.

            tntnatbry Gagan Goel (Inactive) added a comment - For QA: Queries to confirm the issue and verify the fix works are in the issue description.
            dleeyh Daniel Lee (Inactive) added a comment -

            Build verified: 6.1.1 (Drone #2394)

            MariaDB [mytest]> SELECT * FROM (SELECT a FROM t1 UNION SELECT b FROM t1) tu;
            		 
            +---------------------+
            		 
            | a                   |
            		 
            +---------------------+
            		 
            |                 1.0 |
            		 
            | 99999999999999999.0 |
            		 
            |  9999999999999999.0 |
            		 
            +---------------------+
            		 
            3 rows in set (0.096 sec)
            		 
             
            		 
            MariaDB [mytest]> SELECT * FROM (SELECT a FROM t1 UNION ALL SELECT b FROM t1) tu;
            		 
            +---------------------+
            		 
            | a                   |
            		 
            +---------------------+
            		 
            |                 1.0 |
            		 
            | 99999999999999999.0 |
            		 
            |                 1.0 |
            		 
            |  9999999999999999.0 |
            		 
            +---------------------+
            		 
            4 rows in set (0.027 sec)

            dleeyh Daniel Lee (Inactive) added a comment - Build verified: 6.1.1 (Drone #2394) MariaDB [mytest]> SELECT * FROM (SELECT a FROM t1 UNION SELECT b FROM t1) tu; +---------------------+ | a | +---------------------+ | 1.0 | | 99999999999999999.0 | | 9999999999999999.0 | +---------------------+ 3 rows in set (0.096 sec)   MariaDB [mytest]> SELECT * FROM (SELECT a FROM t1 UNION ALL SELECT b FROM t1) tu; +---------------------+ | a | +---------------------+ | 1.0 | | 99999999999999999.0 | | 1.0 | | 9999999999999999.0 | +---------------------+ 4 rows in set (0.027 sec)

            People

              dleeyh Daniel Lee (Inactive)
              bar Alexander Barkov
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              Dates

                Created:
                Updated:
                Resolved:

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