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  1. MariaDB Server
  2. MDEV-6019

Creating CONNECT PIVOT table on large base table crashes server

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    Details

    • Type: Bug
    • Status: Closed (View Workflow)
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 10.0.10
    • Fix Version/s: 10.0.11
    • Component/s: None
    • Labels:
    • Environment:
      Mac OS X, CentOS 6.5

      Description

      I have a table with a couple million rows in it:

      CREATE TABLE `big_table` (
        `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
        `c1` char(32) DEFAULT NULL,
        `c2` char(32) DEFAULT NULL,
        `c3` char(32) DEFAULT NULL,
        PRIMARY KEY (`id`)
      ) ENGINE=InnoDB;

      Each row of the table has different values in the character columns, but all three character columns are the same for each row:

      mysql 10.0.10-MariaDB (root) [test]> select * from big_table limit 10;
      +---------+----------------------------------+----------------------------------+----------------------------------+
      | id      | c1                               | c2                               | c3                               |
      +---------+----------------------------------+----------------------------------+----------------------------------+
      | 1960001 | a64f35b091f92301e81abd6c881efa4c | a64f35b091f92301e81abd6c881efa4c | a64f35b091f92301e81abd6c881efa4c |
      | 1960002 | 3cddf70e775e566a270b3a80ebeb635f | 3cddf70e775e566a270b3a80ebeb635f | 3cddf70e775e566a270b3a80ebeb635f |
      | 1960003 | f3f75c6448ae94cc20c78bcff17b0d92 | f3f75c6448ae94cc20c78bcff17b0d92 | f3f75c6448ae94cc20c78bcff17b0d92 |
      | 1960004 | f0f39711ef82cb8f99443b59ad12f940 | f0f39711ef82cb8f99443b59ad12f940 | f0f39711ef82cb8f99443b59ad12f940 |

      I tried creating a really simple pivot table:

      create table big_table_pivot engine=connect table_type=pivot tabname=big_table;

      Shortly after executing that create table statement, mysqld crashes:

       #0  0x00007ffff6a907fe in __longjmp () from /lib64/libc.so.6
       #1  0x4830f0d22fbc1ec0 in ?? ()

      It crashes even after removing quite a lot of rows. Now with <200,000 rows in the table, the CREATE TABLE statement appears to be hanging, rather than crashing.

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            Assignee:
            bertrandop Olivier Bertrand
            Reporter:
            kolbe Kolbe Kegel (Inactive)
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              Created:
              Updated:
              Resolved:

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