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  1. MariaDB Server
  2. MDEV-5491 CREATE OR REPLACE TABLE
  3. MDEV-5601

Strange error on CREATE OR REPLACE .. SELECT under lock

Details

    • Technical task
    • Status: Closed (View Workflow)
    • Minor
    • Resolution: Won't Fix
    • None
    • 10.0.8
    • None
    • None

    Description

      The following set of commands ends with the error "ERROR 1100 (HY000): Table 't1' was not locked with LOCK TABLES" which is untrue and hence confusing:

      MariaDB [test]> create table t1 (i int);
      		 
      Query OK, 0 rows affected (0.68 sec)
      		 
       
      		 
      MariaDB [test]> lock table t1 write;
      		 
      Query OK, 0 rows affected (0.00 sec)
      		 
       
      		 
      MariaDB [test]> create or replace table t1 as select * from t1;
      		 
      ERROR 1100 (HY000): Table 't1' was not locked with LOCK TABLES

      Test case:

      drop table if exists t1;
      		 
      create table t1 (i int);
      		 
      lock table t1 write;
      		 
      create or replace table t1 as select * from t1;
      		 

      revision-id: monty@askmonty.org-20140202093802-a6jtuy6ni29biigz
      		 
      revno: 3968
      		 
      branch-nick: mariadb-monty

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          monty Michael Widenius added a comment -

          I don't think I can do much about this
          This happens because we try to use t1 twice. If succeed first for the SELECT part, but when we try to lock it again for the create part, it will fail.

          This is the same error that you would get from:

          create table t1 (a int) engine = myisam;
          lock table t1 write;
          select * from t1 where a in (select * from t1);

          This gives the error "Table 't1' was not locked with LOCK TABLES"

          monty Michael Widenius added a comment - I don't think I can do much about this This happens because we try to use t1 twice. If succeed first for the SELECT part, but when we try to lock it again for the create part, it will fail. This is the same error that you would get from: create table t1 (a int) engine = myisam; lock table t1 write; select * from t1 where a in (select * from t1); This gives the error "Table 't1' was not locked with LOCK TABLES"
          monty Michael Widenius added a comment -

          Same error as with other similar usage of locked tables.

          monty Michael Widenius added a comment - Same error as with other similar usage of locked tables.

          People

            monty Michael Widenius
            elenst Elena Stepanova
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            Dates

              Created:
              Updated:
              Resolved:

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