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  1. MariaDB Server
  2. MDEV-13351

Server crashes in st_select_lex::set_explain_type upon UNION with window function

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      CREATE TABLE t1 (i INT);
      INSERT INTO t1 VALUES (1),(2);
      SELECT Nth_value(i,1) OVER() FROM t1 
      UNION ALL 
      ( SELECT Nth_value(i,2) OVER() FROM t1 LIMIT 0 )
      ;
      

      10.2 bc75c57cfc18be64f167d91c431076f581b0382b

      #3  <signal handler called>
      #4  0x00007f66354d542f in st_select_lex::set_explain_type (this=0x7f661c012f88, on_the_fly=true) at /data/src/10.2/sql/sql_lex.cc:4401
      #5  0x00007f66355622d0 in JOIN::save_explain_data_intern (this=0x7f661c014dc0, output=0x7f661c017510, need_tmp_table_arg=true, need_order_arg=false, distinct_arg=false, message=0x7f6635f55d8e "Impossible WHERE") at /data/src/10.2/sql/sql_select.cc:24668
      #6  0x00007f663552b7bd in JOIN::save_explain_data (this=0x7f661c014dc0, output=0x7f661c017510, can_overwrite=false, need_tmp_table=true, need_order=false, distinct=false) at /data/src/10.2/sql/sql_select.cc:3240
      #7  0x00007f6635523cae in JOIN::optimize (this=0x7f661c014dc0) at /data/src/10.2/sql/sql_select.cc:1093
      #8  0x00007f66355c8962 in st_select_lex_unit::optimize (this=0x7f661c0045e8) at /data/src/10.2/sql/sql_union.cc:906
      #9  0x00007f66355c8b99 in st_select_lex_unit::exec (this=0x7f661c0045e8) at /data/src/10.2/sql/sql_union.cc:940
      #10 0x00007f66355c5aba in mysql_union (thd=0x7f661c000b00, lex=0x7f661c004520, result=0x7f661c014390, unit=0x7f661c0045e8, setup_tables_done_option=0) at /data/src/10.2/sql/sql_union.cc:41
      #11 0x00007f6635521430 in handle_select (thd=0x7f661c000b00, lex=0x7f661c004520, result=0x7f661c014390, setup_tables_done_option=0) at /data/src/10.2/sql/sql_select.cc:351
      #12 0x00007f66354ed3c8 in execute_sqlcom_select (thd=0x7f661c000b00, all_tables=0x7f661c012960) at /data/src/10.2/sql/sql_parse.cc:6443
      #13 0x00007f66354e3407 in mysql_execute_command (thd=0x7f661c000b00) at /data/src/10.2/sql/sql_parse.cc:3458
      #14 0x00007f66354f0d88 in mysql_parse (thd=0x7f661c000b00, rawbuf=0x7f661c012378 "SELECT Nth_value(i,1) OVER() FROM t1 \nUNION ALL \n( SELECT Nth_value(i,2) OVER() FROM t1 LIMIT 0 )", length=97, parser_state=0x7f662d0da200, is_com_multi=false, is_next_command=false) at /data/src/10.2/sql/sql_parse.cc:7879
      #15 0x00007f66354dee34 in dispatch_command (command=COM_QUERY, thd=0x7f661c000b00, packet=0x7f661c168011 "SELECT Nth_value(i,1) OVER() FROM t1 \nUNION ALL \n( SELECT Nth_value(i,2) OVER() FROM t1 LIMIT 0 )\n", packet_length=98, is_com_multi=false, is_next_command=false) at /data/src/10.2/sql/sql_parse.cc:1817
      #16 0x00007f66354dd775 in do_command (thd=0x7f661c000b00) at /data/src/10.2/sql/sql_parse.cc:1362
      #17 0x00007f66356294e7 in do_handle_one_connection (connect=0x7f66383f6760) at /data/src/10.2/sql/sql_connect.cc:1354
      #18 0x00007f6635629274 in handle_one_connection (arg=0x7f66383f6760) at /data/src/10.2/sql/sql_connect.cc:1260
      #19 0x00007f6635970922 in pfs_spawn_thread (arg=0x7f6638498f40) at /data/src/10.2/storage/perfschema/pfs.cc:1862
      #20 0x00007f6634b00064 in start_thread (arg=0x7f662d0db700) at pthread_create.c:309
      #21 0x00007f6632ce562d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
      

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            Assignee:
            psergey Sergei Petrunia
            Reporter:
            elenst Elena Stepanova
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              Created:
              Updated:
              Resolved: