CREATE TABLE t1 (f1 VARCHAR(3));

INSERT INTO t1 VALUES ('foo'),('foo');

CREATE TABLE t2 (f2 VARCHAR(3));

INSERT INTO t2 VALUES ('bar'),('qux');

SELECT STRAIGHT_JOIN * FROM ( SELECT * FROM t1 WHERE f1 IN ( SELECT f2 FROM t2 ) ) AS sq;

# Cleanup

DROP TABLE t1, t2;

mysqld: /data/src/5.5/sql/sql_select.cc:6356: int join_tab_cmp_straight(const void*, const void*, const void*): Assertion `!jt1->emb_sj_nest' failed.

170516 13:56:07 [ERROR] mysqld got signal 6 ;

#7  0x00007f88ea52cee2 in __assert_fail () from /lib/x86_64-linux-gnu/libc.so.6

#8  0x000000000063fb7e in join_tab_cmp_straight (dummy=0x0, ptr1=0x7f88e5174a48, ptr2=0x7f88e5174a50) at /data/src/5.5/sql/sql_select.cc:6356

#9  0x0000000000c9093d in my_qsort2 (base_ptr=0x7f88e5174a48, count=2, size=8, cmp=0x63fb20 <join_tab_cmp_straight(void const*, void const*, void const*)>, cmp_argument=0x0) at /data/src/5.5/mysys/mf_qsort.c:131

#10 0x000000000063f760 in choose_plan (join=0x7f88e5198078, join_tables=3) at /data/src/5.5/sql/sql_select.cc:6184

#11 0x000000000063916d in make_join_statistics (join=0x7f88e5198078, tables_list=..., conds=0x7f88e5174078, keyuse_array=0x7f88e5198398) at /data/src/5.5/sql/sql_select.cc:3805

#12 0x00000000006300ce in JOIN::optimize (this=0x7f88e5198078) at /data/src/5.5/sql/sql_select.cc:1234

#13 0x0000000000636a65 in mysql_select (thd=0x7f88e6264060, rref_pointer_array=0x7f88e6267cf0, tables=0x7f88e51815e0, wild_num=1, fields=..., conds=0x0, og_num=0, order=0x0, group=0x0, having=0x0, proc_param=0x0, select_options=2147748610, result=0x7f88e5181c68, unit=0x7f88e6267388, select_lex=0x7f88e6267a68) at /data/src/5.5/sql/sql_select.cc:3085

#14 0x000000000062d352 in handle_select (thd=0x7f88e6264060, lex=0x7f88e62672d8, result=0x7f88e5181c68, setup_tables_done_option=0) at /data/src/5.5/sql/sql_select.cc:319

#15 0x00000000006067b3 in execute_sqlcom_select (thd=0x7f88e6264060, all_tables=0x7f88e51815e0) at /data/src/5.5/sql/sql_parse.cc:4686

#16 0x00000000005ffb26 in mysql_execute_command (thd=0x7f88e6264060) at /data/src/5.5/sql/sql_parse.cc:2234

#17 0x000000000060937e in mysql_parse (thd=0x7f88e6264060, rawbuf=0x7f88e5148078 "SELECT STRAIGHT_JOIN * FROM ( SELECT * FROM t1 WHERE f1 IN ( SELECT f2 FROM t2 ) ) AS sq", length=88, parser_state=0x7f88ebfa0650) at /data/src/5.5/sql/sql_parse.cc:5931

#18 0x00000000005fd0b5 in dispatch_command (command=COM_QUERY, thd=0x7f88e6264060, packet=0x7f88e9f5b061 "SELECT STRAIGHT_JOIN * FROM ( SELECT * FROM t1 WHERE f1 IN ( SELECT f2 FROM t2 ) ) AS sq", packet_length=88) at /data/src/5.5/sql/sql_parse.cc:1079

#19 0x00000000005fc26f in do_command (thd=0x7f88e6264060) at /data/src/5.5/sql/sql_parse.cc:793

#20 0x00000000006fe951 in do_handle_one_connection (thd_arg=0x7f88e6264060) at /data/src/5.5/sql/sql_connect.cc:1268

#21 0x00000000006fe6de in handle_one_connection (arg=0x7f88e6264060) at /data/src/5.5/sql/sql_connect.cc:1184

#22 0x0000000000a0bae7 in pfs_spawn_thread (arg=0x7f88e6f76fc0) at /data/src/5.5/storage/perfschema/pfs.cc:1015

#23 0x00007f88ebbd3494 in start_thread (arg=0x7f88ebfa1700) at pthread_create.c:333

#24 0x00007f88ea5e993f in clone () from /lib/x86_64-linux-gnu/libc.so.6

commit 6b97fe067db1b1d8e8dee56508e6d78a36e92481

Author: Igor Babaev 

Date:   Tue May 9 00:41:45 2017 -0700

    Fixed the bugs mdev-12670 and mdev-12675.

    The code that blocked conversion of a IN subselect pedicate to a semi-join

    if it occurred in the ON expression of an outer join did not do it correctly.

    As a result, the conversion was blocked for IN subselect predicates

    encountered in ON expressions of INNER joins or in WHERE conditions

    of mergeable views / derived tables. This patch fixes this problem.