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  1. MariaDB Server
  2. MDEV-22414

UPDATE or DELETE FOR PORTION OF increments the value of auto-increment column instead of copying the old one

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      Description

      create table t1 (a int auto_increment, b char(16), s date, e date, period for se(s,e), primary key(a,s));
      insert into t1 values (1,'new','2019-01-01','2020-01-01');
      update t1 for portion of se from '2019-07-01' to '2020-07-01' set b = 'updated' where a = 1;
      select * from t1;
      delete from t1 for portion of se from '2019-03-01' to '2019-10-01' where a = 1;
      select * from t1;
       
      drop table t1;
      

      Actual result, 10.4 503fd211

      update t1 for portion of se from '2019-07-01' to '2020-07-01' set b = 'updated' where a = 1;
      select * from t1;
      a	b	s	e
      1	updated	2019-07-01	2020-01-01
      2	new	2019-01-01	2019-07-01
      delete from t1 for portion of se from '2019-03-01' to '2019-10-01' where a = 1;
      select * from t1;
      a	b	s	e
      3	updated	2019-10-01	2020-01-01
      2	new	2019-01-01	2019-07-01
      

      The behavior is not specified in the documentation or (as far as I can tell) in the standard, but it seems obviously wrong, although understandable from the implementation point of view.

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              Assignee:
              nikitamalyavin Nikita Malyavin
              Reporter:
              elenst Elena Stepanova
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                Dates

                Created:
                Updated:
                Resolved:

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