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  1. MariaDB Server
  2. MDEV-35005

vec_distance_cosine can return negative values

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Details

    • Bug
    • Status: Closed (View Workflow)
    • Critical
    • Resolution: Fixed
    • N/A
    • 11.7.1
    • Vector search
    • None

    Description

      vec_distance_cosine function can sometimes return negative values. Apparently it is a result of a rounding error, but still, it looks strange and probably can lead to unexpected results when used in an application.

      set @x=vec_fromtext('[94.542572,8.735560,60.050098,74.043800,90.068710,28.212160,70.854660,69.636841,35.620232,69.190628]');
      		 
      select vec_distance_cosine(@x,@x);

      bb-11.6-MDEV-32887-vector e19526802732b5723664b17ac026a1ea36f99dce

      		 
      MariaDB [test]> select vec_distance_cosine(@x,@x);
      		 
      +----------------------------+
      		 
      | vec_distance_cosine(@x,@x) |
      		 
      +----------------------------+
      		 
      | -0.00000011920928955078125 |
      		 
      +----------------------------+
      		 
      1 row in set (0.001 sec)

      Attachments

        Issue Links

          is caused by

          New Feature - A new feature of the product, which has yet to be developed. MDEV-34939 vector search in 11.7

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

          Activity

            People

              serg Sergei Golubchik
              elenst Elena Stepanova
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              Dates

                Created:
                Updated:
                Resolved:

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