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  1. MariaDB Server
  2. MDEV-16542

Fix ALTER TABLE FORCE to upgrade temporal types

Details

    Description

      Currently there is no an easy way to convert on upgrade old TIME, DATETIME, TIMESTAMP (handled by Field_time, Field_datetime, Field_timestamp) columns to new columns (handled by Field_timef, Field_datetimef, Field_timestampf).

      Conversion is necessary in some scenarios:

      • To import InnoDB table spaces
      • For replication purposes (as old temporal formats did not replicate fractional second precision in the data type metadata)

      Possible conversion options:

      • dump followed by restore
      • "ALTER TABLE t1 MODIFY time_column TIME", i.e. using MODIFY with "same" data type.

      Both ways are not convenient.

      We'll fix ALTER TABLE t1 FORCE to replace old temporal columns according to the current @@mysql56_temporal_format settings:

      • If @@mysql56_temporal_format is true, all TIME, DATETIME, TIMESTAMP columns will be replaced to the new format.
      • If @@mysql56_temporal_format is false, all TIME, DATETIME, TIMESTAMP columns will be replaced to the old format.

      Attachments

        Issue Links

          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. MDEV-9967 Convert old temporal types on ALTER TABLE ... FORCE

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

          Bug - A problem which impairs or prevents the functions of the product. MDEV-12574 MAX(old_decimal) produces a column of the old DECIMAL type

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-15225 Can't import .ibd file with temporal type format differing from mysql56_temporal_format

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

          Task - A task that needs to be done. MDEV-19906 Show internal type for TIMESTAMP, DATETIME, and TIME columns

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

          Task - A task that needs to be done. MDEV-15228 Document how to upgrade old temporal columns

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-29754 Unexpected ER_NOT_FORM_FILE or ER_VERS_FIELD_WRONG_TYPE upon creating system-versioned table under mysql56_temporal_format=0

          • Major - Major loss of function.
          • Closed

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              bar Alexander Barkov
              bar Alexander Barkov
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              Dates

                Created:
                Updated:
                Resolved:

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