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  1. MariaDB Server
  2. MDEV-2428

LP:772309 - join_tab_cmp_straight(): Assertion `!jt2->emb_sj_nest' failed in maria-5.3-mwl89 with semijoin

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Details

    • Bug
    • Status: Closed (View Workflow)
    • Minor
    • Resolution: Fixed
    • None
    • None
    • None

    Description

      Not repeatable in maria-5.3. Requires semijoin.

      Assertion:

      mysqld: sql_select.cc:5438: int join_tab_cmp_straight(const void*, const void*, const void*): Assertion `!jt2->emb_sj_nest' failed.

      backtrace:

      #8 0x006b0d98 in __assert_fail () from /lib/libc.so.6
      #9 0x0831800f in join_tab_cmp_straight (dummy=0x0, ptr1=0xae89eccc, ptr2=0xae89ecd0) at sql_select.cc:5453
      #10 0x08760bc3 in my_qsort2 (base_ptr=0xae89eccc, count=3, size=4,
          cmp=0x8317f8a <join_tab_cmp_straight(void const*, void const*, void const*)>, cmp_argument=0x0) at mf_qsort.c:130
      #11 0x08317cef in choose_plan (join=0xae535b48, join_tables=7) at sql_select.cc:5354
      #12 0x08312fb3 in make_join_statistics (join=0xae535b48, tables_arg=0xae5134f8, conds=0xae5331f0, keyuse_array=0xae53a898)
          at sql_select.cc:3325
      #13 0x0830b216 in JOIN::optimize (this=0xae535b48) at sql_select.cc:1005
      #14 0x081b0174 in st_select_lex::optimize_unflattened_subqueries (this=0xae9f670) at sql_lex.cc:3132
      #15 0x083cae05 in JOIN::optimize_unflattened_subqueries (this=0xae52dcb8) at opt_subselect.cc:3656
      #16 0x0830ccbe in JOIN::optimize (this=0xae52dcb8) at sql_select.cc:1502
      #17 0x08310db9 in mysql_select (thd=0xae9dcd8, rref_pointer_array=0xae9f774, tables=0x0, wild_num=0, fields=..., conds=0x0,
          og_num=0, order=0x0, group=0x0, having=0x0, proc_param=0x0, select_options=2147764742, result=0xae514978, unit=0xae9f3d4,
          select_lex=0xae9f670) at sql_select.cc:2750
      #18 0x08339860 in mysql_explain_union (thd=0xae9dcd8, unit=0xae9f3d4, result=0xae514978) at sql_select.cc:19915
      #19 0x082a654f in execute_sqlcom_select (thd=0xae9dcd8, all_tables=0xae5134f8) at sql_parse.cc:5069
      #20 0x0829d53f in mysql_execute_command (thd=0xae9dcd8) at sql_parse.cc:2235
      #21 0x082a8c70 in mysql_parse (thd=0xae9dcd8,
          rawbuf=0xae512eb0 "EXPLAIN SELECT STRAIGHT_JOIN (\nSELECT f2 FROM t1 WHERE ( f2 ) IN ( SELECT t3.f2 FROM t3 JOIN t2 ON t2.f1 = 1 )\n)", length=113, found_semicolon=0xae8a0228) at sql_parse.cc:6090
      #22 0x0829b1c8 in dispatch_command (command=COM_QUERY, thd=0xae9dcd8, packet=0xaef85d9 "", packet_length=113) at sql_parse.cc:1211
      #23 0x0829a675 in do_command (thd=0xae9dcd8) at sql_parse.cc:904
      #24 0x08297728 in handle_one_connection (arg=0xae9dcd8) at sql_connect.cc:1154
      #25 0x00821919 in start_thread () from /lib/libpthread.so.0
      #26 0x0076acce in clone () from /lib/libc.so.6

      test case:

      CREATE TABLE t1 ( f2 int) ;
      INSERT INTO t1 VALUES (0),(0);

      CREATE TABLE t2 ( f1 int NOT NULL ) ;
      INSERT INTO t2 VALUES (0),(0);

      CREATE TABLE t3 ( f1 int NOT NULL , f2 int) ;
      INSERT INTO t3 VALUES (0,0), (0,0);

      EXPLAIN SELECT STRAIGHT_JOIN (
              SELECT f2 FROM t1 WHERE ( f2 ) IN ( SELECT t3.f2 FROM t3 JOIN t2 ON t2.f1 = 1 )
      );

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            timour Timour Katchaounov (Inactive)
            philipstoev Philip Stoev (Inactive)
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            Dates

              Created:
              Updated:
              Resolved:

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