Uploaded image for project: 'MariaDB Server'
  1. MariaDB Server
  2. MDEV-6853

Unexpected zero result on 1 % <very small decimal> (wrong default precision of the returned result?)

    XMLWordPrintable

Details

    • Bug
    • Status: Open (View Workflow)
    • Minor
    • Resolution: Unresolved
    • 5.5.40
    • 5.5(EOL)
    • None
    • None

    Description

      MariaDB [test]> select 1 % 0.00000000000000000000000000000032349 ;
      +-------------------------------------------+
      | 1 % 0.00000000000000000000000000000032349 |
      +-------------------------------------------+
      |          0.000000000000000000000000000000 |
      +-------------------------------------------+
      1 row in set (0.00 sec)

      Technically, the second operand is outside DECIMAL precision (it has 30 zeros after the point), so it wouldn't be strange if the query considered it 0 and produced 0. But the current result is difficult to explain.

      MySQL 5.5 and PostgreSQL return a non-zero value:

      postgres=# select 1 % 0.00000000000000000000000000000032349 ;
                     ?column?                
      ---------------------------------------
       0.00000000000000000000000000000018574

      MySQL [test]> select 1 % 0.00000000000000000000000000000032349 ;
      +-------------------------------------------+
      | 1 % 0.00000000000000000000000000000032349 |
      +-------------------------------------------+
      |     0.00000000000000000000000000000018574 |
      +-------------------------------------------+
      1 row in set (0.00 sec)

      Attachments

        Issue Links

          Activity

            People

              serg Sergei Golubchik
              elenst Elena Stepanova
              Votes:
              0 Vote for this issue
              Watchers:
              2 Start watching this issue

              Dates

                Created:
                Updated:

                Git Integration

                  Error rendering 'com.xiplink.jira.git.jira_git_plugin:git-issue-webpanel'. Please contact your Jira administrators.