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  1. MariaDB Server
  2. MDEV-15966

Behavior for TRUNCATE versioned table is not documented and not covered by tests

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    Description

      MariaDB [test]> select *, row_start, row_end from t3 for system_time all;
      		 
      +------+----------------------------+----------------------------+
      		 
      | a    | row_start                  | row_end                    |
      		 
      +------+----------------------------+----------------------------+
      		 
      |    1 | 2018-04-22 02:21:24.283521 | 2018-04-22 02:21:27.809661 |
      		 
      |    2 | 2018-04-22 02:21:24.283521 | 2038-01-19 05:14:07.999999 |
      		 
      +------+----------------------------+----------------------------+
      		 
      2 rows in set (0.00 sec)
      		 
       
      		 
      MariaDB [test]> truncate table t3;
      		 
      Query OK, 0 rows affected (0.20 sec)
      		 
       
      		 
      MariaDB [test]> select *, row_start, row_end from t3 for system_time all;
      		 
      Empty set (0.00 sec)

      TRUNCATE TABLE on a versioned table removes all table contents, including historical records. I can only assume it's expected behavior, I can't find it documented anywhere in the KB, and there is no MTR test for TRUNCATE – I found only one test which uses the command, partition.test, but it does not check the result of truncation, it only executes the statement as a regression test for a crash.

      If it works as designed, please add a test and have it documented. If not, then please fix.

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          Bug - A problem which impairs or prevents the functions of the product. MDEV-28439 Inconsistencies of TRUNCATE on SYSTEM VERSIONED tables

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

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              serg Sergei Golubchik
              elenst Elena Stepanova
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                Resolved:

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