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  1. MariaDB Server
  2. MDEV-21029

Incorrect result for expression with the <=> operator and IS NULL

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Details

    • Bug
    • Status: Stalled (View Workflow)
    • Major
    • Resolution: Unresolved
    • 5.5(EOL), 10.0(EOL), 10.1(EOL), 10.2(EOL), 10.3(EOL), 10.4(EOL), 10.5
    • 10.5
    • None
    • None
    • Ubuntu 19.04

    Description

      Hi everyone,

      On the latest trunk version (0308de9), I could observe a bug, as demonstrated by the following test case:

      CREATE TABLE t0(c0 INT);
      INSERT INTO t0 VALUES (1);
      SELECT (c0 > (NULL <=> 0)) IS NULL FROM t0; -- expected: 0, actual: 1
      

      The expression seems to work correctly when it is used in a WHERE condition:

      SELECT * FROM t0 WHERE (c0 > (NULL <=> 0)) IS NULL; -- no row is fetched
      

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              bar Alexander Barkov
              mrigger Manuel Rigger
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              Dates

                Created:
                Updated:

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