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  1. MariaDB Server
  2. MDEV-36440

Double negation is treated as original value in WHERE clause

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Details

    • Bug
    • Status: Confirmed (View Workflow)
    • Major
    • Resolution: Unresolved
    • 11.5.2, 10.5(EOL), 10.6, 10.11, 11.4, 11.8
    • 10.6, 10.11, 11.4, 11.8
    • Optimizer
    • None
    • Ubuntu (x86)

    Description

      Consider the following test case:

      CREATE TABLE t0(c0 INT);
      		 
      INSERT INTO t0(c0) VALUES(123);
      		 
      SELECT t0.c0 AS ref0 FROM t0 WHERE 1 = (NOT(NOT(t0.c0)));

      The query does not fetch any rows.

      The expected result should be:

      ref0
      123

      The condition evaluates to true in the WHERE clause for the row in the table. This is verified as follows:

      SELECT t0.c0, 1 = (NOT(NOT(t0.c0))) FROM t0;

      t0.c0 1 = (NOT(NOT(t0.c0)))
      123 1

      It is likely that the expression NOT(NOT(t0.c0)) was incorrectly optimized as t0.c0.

      Attachments

        Issue Links

          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. MDEV-39728 A BOOLEAN != NOT NOT INT predicate evaluates false in projection but true in filtering

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-39731 A BOOLEAN != NOT NOT BOOLEAN predicate evaluates true in projection but false in filtering

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

          Bug - A problem which impairs or prevents the functions of the product. MDEV-35435 Inconsistent behavior with NOT and ANY in WHERE Clause

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

          Bug - A problem which impairs or prevents the functions of the product. MDEV-37683 incorrect results for NOT operator on DATE_FORMAT with invalid arguments

          • Major - Major loss of function.
          • Confirmed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-39760 Logical query with ! (x LIKE x) NOT IN (x LIKE x) returns incorrect empty result set for valid DOUBLE values

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

          Activity

            People

              psergei Sergei Petrunia
              emilyong Emily Ong
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              Dates

                Created:
                Updated:

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