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  1. MariaDB Server
  2. MDEV-10783

Server crashes in pushdown_cond_for_derived

Details

    Description

      Stack trace from 10.2 1168e2fa54

      #3  <signal handler called>
      #4  0x00007fe1f5c0996d in pushdown_cond_for_derived (thd=0x7fe1ea416070, cond=0x7fe1ea469e50, derived=0x7fe1ea465588) at /data/src/10.2/sql/sql_derived.cc:1182
      #5  0x00007fe1f5c72c71 in JOIN::optimize_inner (this=0x7fe1ea467b28) at /data/src/10.2/sql/sql_select.cc:1264
      #6  0x00007fe1f5c72344 in JOIN::optimize (this=0x7fe1ea467b28) at /data/src/10.2/sql/sql_select.cc:1076
      #7  0x00007fe1f5c7a798 in mysql_select (thd=0x7fe1ea416070, tables=0x7fe1ea464298, wild_num=1, fields=..., conds=0x7fe1ea465ba8, og_num=0, order=0x0, group=0x0, having=0x0, proc_param=0x0, select_options=2147748608, result=0x7fe1ea467b08, unit=0x7fe1ea419b18, select_lex=0x7fe1ea41a250) at /data/src/10.2/sql/sql_select.cc:3535
      #8  0x00007fe1f5c6fea1 in handle_select (thd=0x7fe1ea416070, lex=0x7fe1ea419a50, result=0x7fe1ea467b08, setup_tables_done_option=0) at /data/src/10.2/sql/sql_select.cc:373
      #9  0x00007fe1f5c3f938 in execute_sqlcom_select (thd=0x7fe1ea416070, all_tables=0x7fe1ea464298) at /data/src/10.2/sql/sql_parse.cc:6345
      #10 0x00007fe1f5c3576e in mysql_execute_command (thd=0x7fe1ea416070) at /data/src/10.2/sql/sql_parse.cc:3376
      #11 0x00007fe1f5c430d7 in mysql_parse (thd=0x7fe1ea416070, rawbuf=0x7fe1ea464088 "SELECT * FROM t WHERE 1 IN ( SELECT * FROM v )", length=46, parser_state=0x7fe1f6b91dd0, is_com_multi=false, is_next_command=false) at /data/src/10.2/sql/sql_parse.cc:7774
      #12 0x00007fe1f5c314c5 in dispatch_command (command=COM_QUERY, thd=0x7fe1ea416070, packet=0x7fe1ea458071 "SELECT * FROM t WHERE 1 IN ( SELECT * FROM v )", packet_length=46, is_com_multi=false, is_next_command=false) at /data/src/10.2/sql/sql_parse.cc:1805
      #13 0x00007fe1f5c2fef6 in do_command (thd=0x7fe1ea416070) at /data/src/10.2/sql/sql_parse.cc:1365
      #14 0x00007fe1f5d6b7ba in do_handle_one_connection (connect=0x7fe1f286d410) at /data/src/10.2/sql/sql_connect.cc:1354
      #15 0x00007fe1f5d6b547 in handle_one_connection (arg=0x7fe1f286d410) at /data/src/10.2/sql/sql_connect.cc:1260
      #16 0x00007fe1f6079b26 in pfs_spawn_thread (arg=0x7fe1f28519f0) at /data/src/10.2/storage/perfschema/pfs.cc:1862
      #17 0x00007fe1f52b40a4 in start_thread (arg=0x7fe1f6b93300) at pthread_create.c:309
      #18 0x00007fe1f346c87d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
      

      CREATE TABLE t (i INT) ENGINE=MyISAM;
      CREATE VIEW v AS SELECT 5;
      SELECT * FROM t WHERE 1 IN ( SELECT * FROM v );
      

      The problem started happening after recent merges, but I can't point at the exact commit which caused it.

      Attachments

        Activity

          It looks like problem with connecting SELECTs/UNITs.

          For now it meet upper SELECT without JOIN. Taking into account how SELECTs optimizing it should not be possible...

          sanja Oleksandr Byelkin added a comment - It looks like problem with connecting SELECTs/UNITs. For now it meet upper SELECT without JOIN. Taking into account how SELECTs optimizing it should not be possible...

          Structure is correct. and it is pushing down. and it trying to push in SELECT which has no JOIN... (SELECT is simple maybe just removed or materialized?)

          sanja Oleksandr Byelkin added a comment - Structure is correct. and it is pushing down. and it trying to push in SELECT which has no JOIN... (SELECT is simple maybe just removed or materialized?)

          The view is already materialized and cleaned up, that is why it is has no JOIN and that is why it is too late something pushdown in it.

          sanja Oleksandr Byelkin added a comment - The view is already materialized and cleaned up, that is why it is has no JOIN and that is why it is too late something pushdown in it.

          will discuss with igor how better to detect situation.

          sanja Oleksandr Byelkin added a comment - will discuss with igor how better to detect situation.

          The fix for this bug was pushed into the 10.2 tree.

          igor Igor Babaev (Inactive) added a comment - The fix for this bug was pushed into the 10.2 tree.

          People

            igor Igor Babaev (Inactive)
            elenst Elena Stepanova
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            Dates

              Created:
              Updated:
              Resolved:

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