Uploaded image for project: 'MariaDB Server'
  1. MariaDB Server
  2. MDEV-6017

Add support for Indexes on Expressions

    XMLWordPrintable

    Details

      Description

      An index on expression means something like

      CREATE TABLE t1 (a int, b int, INDEX (a/2+b));
      ...
      SELECT * FROM t1 WHERE a/2+b=100;
      

      in this case the optimizer should be able to use an index.

      This task naturally splits in two steps:

      1. add expression matching into the optimizer, use it for generated columns. Like in
        CREATE TABLE t1 (a int, b int, c INT GENERATED ALWAYS AS (a/2+b), INDEX (c));
      2. support the syntax to create an index on expression directly, this will automatically create a hidden generated column under the hood

      original task description is visible in the history

        Attachments

          Issue Links

            Activity

              People

              Assignee:
              serg Sergei Golubchik
              Reporter:
              fale Fabio Alessandro Locati
              Votes:
              14 Vote for this issue
              Watchers:
              22 Start watching this issue

                Dates

                Created:
                Updated: