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  1. MariaDB Server
  2. MDEV-6103

Adding/removing non-materialized virtual column triggers table recreation

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Details

    • Bug
    • Status: Closed (View Workflow)
    • Critical
    • Resolution: Fixed
    • 5.5.36, 10.0.10
    • 10.0.12
    • None
    • None
    • 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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              svoj Sergey Vojtovich
              hsc Horst Schirmeier
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              Dates

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                Updated:
                Resolved:

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