Commit 708740c8 authored by unknown's avatar unknown
Browse files

After merge fix.

parent 47c727a1

sql/sql_table.cc

+9 −0
Original line number Diff line number Diff line
@@ -4709,6 +4709,14 @@ static uint compare_tables(TABLE *table, List<create_field> *create_list, 
    At the moment we can't handle altering temporary tables without a copy.

    We also test if OPTIMIZE TABLE was given and was mapped to alter table.

    In that case we always do full copy.



    There was a bug prior to mysql-4.0.25. Number of null fields was

    calculated incorrectly. As a result frm and data files gets out of

    sync after fast alter table. There is no way to determine by which

    mysql version (in 4.0 and 4.1 branches) table was created, thus we

    disable fast alter table for all tables created by mysql versions

    prior to 5.0 branch.

    See BUG#6236.

  */

  if (table->s->fields != create_list->elements ||

      table->s->db_type != create_info->db_type ||
@@ -4718,6 +4726,7 @@ static uint compare_tables(TABLE *table, List<create_field> *create_list, 
      create_info->used_fields & HA_CREATE_USED_DEFAULT_CHARSET ||

      (alter_info->flags & (ALTER_RECREATE | ALTER_FOREIGN_KEY)) ||

      order_num ||

      !table->s->mysql_version ||

      (table->s->frm_version < FRM_VER_TRUE_VARCHAR && varchar))

    DBUG_RETURN(ALTER_TABLE_DATA_CHANGED);