Uploaded image for project: 'MariaDB Server'
  1. MariaDB Server
  2. MDEV-3929

Add system variable explicit_defaults_for_timestamp for compatibility with MySQL

    XMLWordPrintable

Details

    • 10.1.6-2, 10.1.8-1, 10.1.8-2

    Description

      As the description of the main task MDEV-452 already mentions, MySQL implementation has the variable explicit_defaults_for_timestamp which modifies the behavior of auto-updated temporal columns. Since the planned release approaches and we don't have the variable yet, we either need to add it now, or decide to release without it, and add it in further versions. Either is okay as long as it's not completely forgotten.

      The definition of MySQL's implementation can be found here:
      http://dev.mysql.com/doc/refman/5.6/en/server-system-variables.html#sysvar_explicit_defaults_for_timestamp

      What we should do in MariaDB:

      • Add this new variable and have it work as MySQL when enabled.
      • Have it disabled as default, to not cause incompatibilities with old applications
      • Always keep the variable around (not make it deprecated) as we don't want to have it default.
      • Add a MYSQL mode where, if enabled, this variable is set.

      TODO: check how replication of this variable works in MySQL.

      Attachments

        Issue Links

          blocks

          Task - A task that needs to be done. MDEV-8455 Make explicit_defaults_for_timestamp dynamic

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

          Task - A task that needs to be done. MDEV-5994 MySQL WL#6292 - Make TIMESTAMP columns nullable by default

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

          Bug - A problem which impairs or prevents the functions of the product. MDEV-7824 [Bug #68041] Zero date can be inserted in strict no-zero mode through a default value

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-7831 Bad warning for DATE_ADD(timestamp_column, INTERVAL 10 SECOND)

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-8441 Bad SHOW CREATE TABLE output for a table with a virtual column

          • Major - Major loss of function.
          • Closed
          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. MDEV-5836 MySQL WL#6292 - Make TIMESTAMP columns nullable by default

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

          Task - A task that needs to be done. MDEV-452 Add full support for auto-initialized/updated timestamp and datetime

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-28983 TIMESTAMP logic remains partly non-standard with explicit_defaults_for_timestamp

          • Major - Major loss of function.
          • Open
          links to

          Web Link Bug #68472

          Activity

            People

              bar Alexander Barkov
              elenst Elena Stepanova
              Votes:
              1 Vote for this issue
              Watchers:
              6 Start watching this issue

              Dates

                Created:
                Updated:
                Resolved:

                Git Integration

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