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  1. MariaDB Server
  2. MDEV-28577

Table discovery allows unsupported Federated structure

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    Description

      --source suite/federated/have_federatedx.inc
      		 
       
      		 
      create table t (a int, b int as (a));
      		 
      --eval create table tf connection 'mysql://root@127.0.0.1:$MASTER_MYPORT/test/t' engine=Federated
      		 
       
      		 
      show create table tf;
      		 
       
      		 
      # Cleanup
      		 
      drop table tf, t;

      In the test case above, the table is created without errors or warnings, but then any action on this table fails with ER_UNSUPPORTED_ENGINE_FOR_GENERATED_COLUMNS:

      10.3 730eb1c4

      		 
      mysqltest: At line 6: query 'show create table tf' failed: 1910: FEDERATED storage engine does not support generated columns

      The unpleasant (and possibly realistic) side-effect is that such tables break mysqldump and some queries from INFORMATION_SCHEMA.

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          elenst Elena Stepanova created issue -
          elenst Elena Stepanova made changes -
          Field Original Value New Value
          Description {code:sql}
          --source suite/federated/have_federatedx.inc

          create table t (a int, b int as (a));
          --eval create table tf connection 'mysql://root@127.0.0.1:$MASTER_MYPORT/test/t' engine=Federated

          show create table tf;

          # Cleanup
          drop table tf, t;
          {code}

          In the test case above, the table is created without errors or warnings, but then any action on this table fails with ER_UNSUPPORTED_ENGINE_FOR_GENERATED_COLUMNS:

          {code:sql|title=10.3 730eb1c4}
          mysqltest: At line 6: query 'show create table tf' failed: 1910: FEDERATED storage engine does not support generated columns
          {code}

          The unpleasant (and possibly realistic) side-effect is that such tables break {{mysqldump}}.
          		{code:sql}
          --source suite/federated/have_federatedx.inc

          create table t (a int, b int as (a));
          --eval create table tf connection 'mysql://root@127.0.0.1:$MASTER_MYPORT/test/t' engine=Federated

          show create table tf;

          # Cleanup
          drop table tf, t;
          {code}

          In the test case above, the table is created without errors or warnings, but then any action on this table fails with ER_UNSUPPORTED_ENGINE_FOR_GENERATED_COLUMNS:

          {code:sql|title=10.3 730eb1c4}
          mysqltest: At line 6: query 'show create table tf' failed: 1910: FEDERATED storage engine does not support generated columns
          {code}

          The unpleasant (and possibly realistic) side-effect is that such tables break {{mysqldump}} and some queries from {{INFORMATION_SCHEMA}}.
          julien.fritsch Julien Fritsch made changes -
          Fix Version/s 10.7 [ 24805 ]
          julien.fritsch Julien Fritsch made changes -
          Fix Version/s 10.3 [ 22126 ]
          julien.fritsch Julien Fritsch made changes -
          Fix Version/s 10.8 [ 26121 ]
          julien.fritsch Julien Fritsch made changes -
          Fix Version/s 10.4 [ 22408 ]

          People

            sanja Oleksandr Byelkin
            elenst Elena Stepanova
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            Dates

              Created:
              Updated:

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