CREATE TABLE t1 (id int NOT NULL AUTO_INCREMENT PRIMARY KEY );
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CREATE TABLE t2 (id int zerofill);
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SELECT 1 FROM t2 WHERE t2.id IN (SELECT MIN(t1.id) from t1);
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Thread 1 (Thread 0x7f4a3db70700 (LWP 7881)):
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#0 __pthread_kill (threadid=<optimized out>, signo=6) at ../sysdeps/unix/sysv/linux/pthread_kill.c:62
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#1 0x00005570b2582761 in my_write_core (sig=6) at /home/alice/git/10.4/mysys/stacktrace.c:481
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#2 0x00005570b1dc50d1 in handle_fatal_signal (sig=6) at /home/alice/git/10.4/sql/signal_handler.cc:305
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#3 <signal handler called>
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#4 0x00007f4a4372c428 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:54
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#5 0x00007f4a4372e02a in __GI_abort () at abort.c:89
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#6 0x00007f4a43724bd7 in __assert_fail_base (fmt=<optimized out>, assertion=assertion@entry=0x5570b27a8ad0 "ctx.compare_type_handler()->cmp_type() != STRING_RESULT", file=file@entry=0x5570b27a8958 "/home/alice/git/10.4/sql/field.cc", line=line@entry=1417, function=function@entry=0x5570b27a9da0 <Field_num::get_equal_zerofill_const_item(THD*, Value_source::Context const&, Item*)::__PRETTY_FUNCTION__> "Item* Field_num::get_equal_zerofill_const_item(THD*, const Value_source::Context&, Item*)") at assert.c:92
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#7 0x00007f4a43724c82 in __GI___assert_fail (assertion=0x5570b27a8ad0 "ctx.compare_type_handler()->cmp_type() != STRING_RESULT", file=0x5570b27a8958 "/home/alice/git/10.4/sql/field.cc", line=1417, function=0x5570b27a9da0 <Field_num::get_equal_zerofill_const_item(THD*, Value_source::Context const&, Item*)::__PRETTY_FUNCTION__> "Item* Field_num::get_equal_zerofill_const_item(THD*, const Value_source::Context&, Item*)") at assert.c:101
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#8 0x00005570b1d8f972 in Field_num::get_equal_zerofill_const_item (this=0x7f49f4035898, thd=0x7f49f4000b00, ctx=..., const_item=0x7f49f4019898) at /home/alice/git/10.4/sql/field.cc:1417
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#9 0x00005570b1db4cff in Field_num::get_equal_const_item (this=0x7f49f4035898, thd=0x7f49f4000b00, ctx=..., const_item=0x7f49f4019898) at /home/alice/git/10.4/sql/field.h:1674
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#10 0x00005570b1b3b83c in check_simple_equality (thd=0x7f49f4000b00, ctx=..., left_item=0x7f49f4015ae8, right_item=0x7f49f4019898, cond_equal=0x7f4a3db6e540) at /home/alice/git/10.4/sql/sql_select.cc:13682
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#11 0x00005570b1c95cde in and_new_conditions_to_optimized_cond (thd=0x7f49f4000b00, cond=0x0, cond_eq=0x7f49f4018028, new_conds=..., cond_value=0x7f49f4017f00) at /home/alice/git/10.4/sql/opt_subselect.cc:5493
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#12 0x00005570b1b19e46 in JOIN::optimize_inner (this=0x7f49f4017bf0) at /home/alice/git/10.4/sql/sql_select.cc:1708
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#13 0x00005570b1b18f33 in JOIN::optimize (this=0x7f49f4017bf0) at /home/alice/git/10.4/sql/sql_select.cc:1448
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#14 0x00005570b1b22e43 in mysql_select (thd=0x7f49f4000b00, tables=0x7f49f4015478, wild_num=0, fields=..., conds=0x7f49f40170f0, og_num=0, order=0x0, group=0x0, having=0x0, proc_param=0x0, select_options=2147748608, result=0x7f49f4017bd0, unit=0x7f49f40049a8, select_lex=0x7f49f4014f68) at /home/alice/git/10.4/sql/sql_select.cc:4261
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#15 0x00005570b1b149d6 in handle_select (thd=0x7f49f4000b00, lex=0x7f49f40048e0, result=0x7f49f4017bd0, setup_tables_done_option=0) at /home/alice/git/10.4/sql/sql_select.cc:382
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#16 0x00005570b1adf315 in execute_sqlcom_select (thd=0x7f49f4000b00, all_tables=0x7f49f4015478) at /home/alice/git/10.4/sql/sql_parse.cc:6545
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#17 0x00005570b1ad576e in mysql_execute_command (thd=0x7f49f4000b00) at /home/alice/git/10.4/sql/sql_parse.cc:3768
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#18 0x00005570b1ae304d in mysql_parse (thd=0x7f49f4000b00, rawbuf=0x7f49f4014e88 "SELECT 1 FROM t2 WHERE t2.id IN (SELECT MIN(t1.id) from t1)", length=59, parser_state=0x7f4a3db6f5f0, is_com_multi=false, is_next_command=false) at /home/alice/git/10.4/sql/sql_parse.cc:8063
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#19 0x00005570b1ad01d0 in dispatch_command (command=COM_QUERY, thd=0x7f49f4000b00, packet=0x7f49f412e0d1 "SELECT 1 FROM t2 WHERE t2.id IN (SELECT MIN(t1.id) from t1)", packet_length=59, is_com_multi=false, is_next_command=false) at /home/alice/git/10.4/sql/sql_parse.cc:1847
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#20 0x00005570b1acebed in do_command (thd=0x7f49f4000b00) at /home/alice/git/10.4/sql/sql_parse.cc:1392
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#21 0x00005570b1c35613 in do_handle_one_connection (connect=0x5570b4b5fe30) at /home/alice/git/10.4/sql/sql_connect.cc:1402
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#22 0x00005570b1c35364 in handle_one_connection (arg=0x5570b4b5fe30) at /home/alice/git/10.4/sql/sql_connect.cc:1308
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#23 0x00005570b2512baa in pfs_spawn_thread (arg=0x5570b4b67f20) at /home/alice/git/10.4/storage/perfschema/pfs.cc:1862
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#24 0x00007f4a443696ba in start_thread (arg=0x7f4a3db70700) at pthread_create.c:333
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#25 0x00007f4a437fe41d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
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Bug
Major
The bug appears in DBUG_ASSERT(ctx.compare_type_handler()->cmp_type() != STRING_RESULT); call in Field_num::get_equal_zerofill_const_item() method.
(gdb) print ctx.compare_type_handler()->cmp_type()$2 = STRING_RESULTThis means that cmp_type() should already be defined on this step. Field "t2.`id`" wasn't fixed and fix_fields() call is missing.
"t2.`id`" is a part of "t2.`id` = NULL" condition that was created in execute_degenerate_jtbm_semi_join() method. This method was created in
MDEV-12387as a result of refactoring of setup_jtbm_semi_joins() method.Comparing versions before and after
MDEV-12387changes it can be seen that fix_fields() call for the case when degenerated semi join is defined is missing. This call should be made just after the creation of equalities.