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  1. MariaDB Server
  2. MDEV-6103

Adding/removing non-materialized virtual column triggers table recreation

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    Details

    • Type: Bug
    • Status: Closed (View Workflow)
    • Priority: Critical
    • Resolution: Fixed
    • Affects Version/s: 5.5.36, 10.0.10
    • Fix Version/s: 10.0.12
    • Component/s: None
    • Labels:
      None
    • Environment:
      32-Bit Debian 7

      Description

      When adding or removing a non-materialized virtual column to/from a MyISAM table with ALTER TABLE, MariaDB recreates the whole table although only the metadata should be affected:

      MariaDB [test]> ALTER TABLE test ADD COLUMN testcolumn INT AS (othercolumn+1) VIRTUAL;
      Stage: 1 of 2 'copy to tmp table'  0.001% of stage done

      This is especially annoying for multi-gigabyte tables, where this operation takes a long time.

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              Assignee:
              svoj Sergey Vojtovich
              Reporter:
              hsc Horst Schirmeier
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                Dates

                Created:
                Updated:
                Resolved: