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  1. MariaDB Server
  2. MDEV-16849

Extending indexed VARCHAR column should be instantaneous

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      MySQL 5.7 (which was merged to MariaDB 10.2.2) implements an instantaneous change of the maximum length of a VARCHAR column when the length is increasing and not crossing the 255-byte boundary.

      Alas, when the VARCHAR column was indexed, the indexes would be dropped and added. This should be avoided.

      MySQL 5.7.23 addressed this by changing the storage engine API. We would prefer a less intrusive change. InnoDB should be able to ‘optimize away’ pairs of DROP INDEX and ADD INDEX operations. (While doing that, InnoDB in MariaDB should support the renaming of indexes as well, without introducing the RENAME INDEX syntax from MySQL 5.7.)

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          Task - A task that needs to be done. MDEV-11424 Instant ALTER TABLE of failure-free record format changes

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed
          is duplicated by

          Task - A task that needs to be done. MDEV-17965 Allow instant VARCHAR increase of indexed fields

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

          Task - A task that needs to be done. MDEV-15563 Instant failure-free data type conversions

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-16850 Merge new release of InnoDB 5.7.23 to 10.2

          • Blocker - Blocks development and/or testing work, production could not run.
          • Closed

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              thiru Thirunarayanan Balathandayuthapani
              marko Marko Mäkelä
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