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  1. MariaDB Server
  2. MDEV-30039

Crash when using count (distinct) combined with rank()

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      Description

      MariaDB service crashes when using Count() on distinct values in a column when also using Rank(). The specific query causing issues is:

      {{select d.department_name , d.department_id , count (DISTINCT employee_id) as employees,
      sum(salary) as total_salary,
      RANK() over (order by sum(salary) DESC) as rank_sal
      from employees e left join departments d
      on e.department_id = d.department_id
      group by d.department_name , d.department_id
      LIMIT 0, 200}}

      The error message is as follows:

      {{[ERROR] mysqld got signal 11 ;
      This could be because you hit a bug. It is also possible that this binary
      or one of the libraries it was linked against is corrupt, improperly built,
      or misconfigured. This error can also be caused by malfunctioning hardware.
      To report this bug, see https://mariadb.com/kb/en/reporting-bugs
      We will try our best to scrape up some info that will hopefully help
      diagnose the problem, but since we have already crashed,
      something is definitely wrong and this may fail.
      Server version: 10.6.7-MariaDB-2ubuntu1.1
      key_buffer_size=20971520
      read_buffer_size=131072
      max_used_connections=1
      max_threads=153
      thread_count=1
      It is possible that mysqld could use up to
      key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 357365 K bytes of memory
      Hope that's ok; if not, decrease some variables in the equation.
      Thread pointer: 0x7f75c0000c68
      Attempting backtrace. You can use the following information to find out
      where mysqld died. If you see no messages after this, something went
      terribly wrong...
      stack_bottom = 0x7f7601cf4c78 thread_stack 0x49000
      ??:0(my_print_stacktrace)[0x562d3da11702]
      ??:0(handle_fatal_signal)[0x562d3d54c4d8]
      ??:0(__sigaction)[0x7f7612542520]
      ??:0(filesort(THD*, TABLE*, Filesort*, Filesort_tracker*, JOIN*, unsigned long long))[0x562d3d549b09]
      ??:0(create_sort_index(THD*, JOIN*, st_join_table*, Filesort*))[0x562d3d381562]
      ??:0(Window_funcs_sort::exec(JOIN*, bool))[0x562d3d4c1393]
      ??:0(Window_funcs_computation::exec(JOIN*, bool))[0x562d3d4c1d7b]
      ??:0(AGGR_OP::end_send())[0x562d3d38ea2e]
      ??:0(sub_select_postjoin_aggr(JOIN*, st_join_table*, bool))[0x562d3d38ed70]
      ??:0(JOIN::exec_inner())[0x562d3d398616]
      ??:0(JOIN::exec())[0x562d3d398b69]
      ??:0(mysql_select(THD*, TABLE_LIST*, List<Item>&, Item*, unsigned int, st_order*, st_order*, Item*, st_ord>
      ??:0(handle_select(THD*, LEX*, select_result*, unsigned long))[0x562d3d3971a7]
      ??:0(comp_ne_creator(bool))[0x562d3d326d9c]
      ??:0(mysql_execute_command(THD*, bool))[0x562d3d333754]
      ??:0(mysql_parse(THD*, char*, unsigned int, Parser_state*))[0x562d3d334ba8]
      ??:0(dispatch_command(enum_server_command, THD*, char*, unsigned int, bool))[0x562d3d336815]
      ??:0(do_command(THD*, bool))[0x562d3d3381b7]
      ??:0(do_handle_one_connection(CONNECT*, bool))[0x562d3d437e5f]
      ??:0(handle_one_connection)[0x562d3d4381dd]
      ??:0(MyCTX_nopad::finish(unsigned char*, unsigned int*))[0x562d3d776386]
      ??:0(pthread_condattr_setpshared)[0x7f7612594b43]
      ??:0(__xmknodat)[0x7f7612626a00]
      Trying to get some variables.
      Some pointers may be invalid and cause the dump to abort.
      Query (0x7f75c0012560): select d.department_name , d.department_id , count (distinct employee_id) as emplo>
      sum(salary) as total_salary,
      rank() over (order by sum(salary) DESC) as rank_sal
      from employees e left join departments d
      on e.department_id = d.department_id
      group by d.department_name , d.department_id
      LIMIT 0, 200
      Connection ID (thread ID): 5
      Status: NOT_KILLED}}

      If we remove the DISTINCT or the RANK() function, the query runs successfully. Additionally, modifying the left join to be an inner join also allows the query to run.

      I have also tested this on a brand new MariaDB 10.10.2 install on a Docker Debian container with the same failure.

      I have attached the sample data we are running this query against.

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              Assignee:
              Unassigned Unassigned
              Reporter:
              chriszissis Christopher Zissis
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                Created:
                Updated:
                Resolved:

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