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  1. MariaDB Server
  2. MDEV-31730

Cursor protocol returns wrong result for 'SELECT MIN(b)-a' where 'a' and 'b' have TIMESTAMP datatype

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Details

    • Bug
    • Status: Open (View Workflow)
    • Major
    • Resolution: Unresolved
    • 10.4, 10.5, 10.6, 10.9, 10.10, 11.0, 11.1, 11.2
    • 10.4, 10.5, 10.6, 11.1, 11.2
    • None
    • None

    Description

      Testcase (run MTR test with --cursor-protocol):

      CREATE  TABLE t1 (a TIMESTAMP(4), b TIMESTAMP DEFAULT 0) ENGINE=MyISAM;
      		 
      INSERT IGNORE INTO t1 (a) VALUES ('2001-01-01'),('2003-01-01');
      		 
      SELECT MIN(b)-a FROM t1;
      		 
      SELECT (SELECT MIN(b) FROM t1) - a FROM t1;
      		 
      DROP TABLE t1;

      Expected result:

      SELECT MIN(b)-a FROM t1;
      		 
      MIN(b)-a
      		 
      -20010101000000.0000
      		 
      SELECT (SELECT MIN(b) FROM t1) - a FROM t1;
      		 
      (SELECT MIN(b) FROM t1) - a
      		 
      -20010101000000.0000
      		 
      -20030101000000.0000

      Actual result:

      SELECT MIN(b)-a FROM t1;
      		 
      MIN(b)-a
      		 
      0.0000
      		 
      SELECT (SELECT MIN(b) FROM t1) - a FROM t1;
      		 
      (SELECT MIN(b) FROM t1) - a
      		 
      0.0000
      		 
      0.0000

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        Issue Links

          relates to

          Technical task - A technical task. MDEV-31005 Make working cursor-protocol

          • Major - Major loss of function.
          • In Progress

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              sanja Oleksandr Byelkin
              lstartseva Lena Startseva
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              Dates

                Created:
                Updated:

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