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  1. MariaDB Server
  2. MDEV-28057

Online log for virtual index doesn't compute virtual column value

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      Description

      InnoDB concurrent DML doesn't compute virtual column value during index build DDL. It leads to insertion of NULL value.

      --source include/have_innodb.inc
      --source include/have_debug.inc
       
      create table t1(f1 int not null, f2 int not null,
                      f3 int as (f2) virtual, index(f1),
                      index(f2))engine=innodb;
      insert into t1(f1, f2) values(1, 2);
      set DEBUG_SYNC="innodb_inplace_alter_table_enter SIGNAL dml_start WAIT_FOR dml_finish";
      send alter table t1 add index(f3), algorithm=inplace;
      connect(con1,localhost,root,,,);
      set DEBUG_SYNC="now WAIT_FOR dml_start";
      BEGIN;
      INSERT INTO t1(f1, f2) VALUES(3, 4);
      UPDATE t1 SET f2= 5 WHERE f2= 4;
      COMMIT;
      set DEBUG_SYNC="now SIGNAL dml_finish";
      disconnect con1;
      connection default;
      reap;
       
      check table t1;
      drop table t1;
       
      select f3 from t1 use index(f3);
      drop table t1;
      set debug_sync=reset;
      

      10.7 e67d46e4a16a6550734dbff8d1a28c578ab3b23d

      check table t1;
      Table	Op	Msg_type	Msg_text
      test.t1	check	Warning	InnoDB: Index 'f3' contains 3 entries, should be 2.
      test.t1	check	error	Corrupt
      drop table t1;
      set debug_sync=reset;
      

      Server fails to send the value of virtual column for the secondary index tuple when index is being created.

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            Assignee:
            nikitamalyavin Nikita Malyavin
            Reporter:
            thiru Thirunarayanan Balathandayuthapani
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              Updated:

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