CREATE TABLE t1(a INT, b INT, c INT, d INT);

CREATE TABLE t2 (x INT, y BLOB, z BLOB, w BLOB);

INSERT INTO t1 VALUES (1,2,1,1),(1,3,0,4),(2,4,2,2);

INSERT INTO t2 VALUES (2,'aab','aab','x'),(1,'aa','b','.'),

                      (1,'ddd','n ','s'), (1,'ddd','ddd ','d');

SELECT (

  SELECT (

    SELECT t1_out.a

    FROM t1 AS t1_in

    GROUP BY t1_in.a

    HAVING t1_out.a > 1

    LIMIT 1

  )

  FROM t1 AS t1_out

  GROUP BY t1_out.a

  LIMIT 1

) FROM t2 GROUP BY t2.x;

drop table t1,t2;

mysqld: /home/galina/mariadb/5.5-mariadb/sql/item.cc:4629: Item** resolve_ref_in_select_and_group(THD*, Item_ident*, SELECT_LEX*): Assertion `(*select_ref)->fixed' failed.

190702 11:20:40 [ERROR] mysqld got signal 6 ;

stdlib/abort.c:81(__GI_abort)[0x7ff382c82801]

assert/assert.c:89(__assert_fail_base)[0x7ff382c7239a]

/lib/x86_64-linux-gnu/libc.so.6(+0x30412)[0x7ff382c72412]

sql/item.cc:4630(resolve_ref_in_select_and_group(THD*, Item_ident*, st_select_lex*))[0x55db67f738c2]

sql/item.cc:6826(Item_ref::fix_fields(THD*, Item**))[0x55db67f7938e]

sql/item_func.cc:204(Item_func::fix_fields(THD*, Item**))[0x55db67fb4525]

sql/sql_select.cc:770(JOIN::prepare(Item***, TABLE_LIST*, unsigned int, Item*, unsigned int, st_order*, bool, st_order*, Item*, st_order*, st_select_lex*, st_select_lex_unit*))[0x55db67dbfbb0]

sql/item_subselect.cc:3084(subselect_single_select_engine::prepare(THD*))[0x55db67ff7bab]

sql/item_subselect.cc:249(Item_subselect::fix_fields(THD*, Item**))[0x55db67fef5c0]

sql/sql_base.cc:8206(setup_fields(THD*, Item**, List<Item>&, enum_mark_columns, List<Item>*, List<Item>*, bool))[0x55db67d34b3c]

sql/sql_select.cc:732(JOIN::prepare(Item***, TABLE_LIST*, unsigned int, Item*, unsigned int, st_order*, bool, st_order*, Item*, st_order*, st_select_lex*, st_select_lex_unit*))[0x55db67dbf7a9]

sql/item_subselect.cc:3084(subselect_single_select_engine::prepare(THD*))[0x55db67ff7bab]

sql/item_subselect.cc:249(Item_subselect::fix_fields(THD*, Item**))[0x55db67fef5c0]

sql/sql_base.cc:8206(setup_fields(THD*, Item**, List<Item>&, enum_mark_columns, List<Item>*, List<Item>*, bool))[0x55db67d34b3c]

sql/sql_select.cc:732(JOIN::prepare(Item***, TABLE_LIST*, unsigned int, Item*, unsigned int, st_order*, bool, st_order*, Item*, st_order*, st_select_lex*, st_select_lex_unit*))[0x55db67dbf7a9]

sql/sql_select.cc:3111(mysql_select(THD*, Item***, TABLE_LIST*, unsigned int, List<Item>&, Item*, unsigned int, st_order*, st_order*, Item*, st_order*, unsigned long long, select_result*, st_select_lex_unit*, st_select_lex*))[0x55db67dc888f]

sql/sql_select.cc:311(handle_select(THD*, LEX*, select_result*, unsigned long))[0x55db67dbe8b8]

sql/sql_parse.cc:4680(execute_sqlcom_select(THD*, TABLE_LIST*))[0x55db67d94b63]

sql/sql_parse.cc:2225(mysql_execute_command(THD*))[0x55db67d8d600]

sql/sql_parse.cc:5925(mysql_parse(THD*, char*, unsigned int, Parser_state*))[0x55db67d97a87]

sql/sql_parse.cc:1069(dispatch_command(enum_server_command, THD*, char*, unsigned int))[0x55db67d8a9a4]

sql/sql_parse.cc:793(do_command(THD*))[0x55db67d89b45]

sql/sql_connect.cc:1268(do_handle_one_connection(THD*))[0x55db67e9fe01]

sql/sql_connect.cc:1185(handle_one_connection)[0x55db67e9fb6b]

perfschema/pfs.cc:1017(pfs_spawn_thread)[0x55db6825a7e2]

nptl/pthread_create.c:463(start_thread)[0x7ff3839656db]

x86_64/clone.S:97(clone)[0x7ff382d6388f]

Query (0x7ff374007688): SELECT ( SELECT ( SELECT t1_out.a FROM t1 AS t1_in GROUP BY t1_in.a HAVING t1_out.a > 1 LIMIT 1 ) FROM t1 AS t1_out GROUP BY t1_out.a LIMIT 1 ) FROM t2 GROUP BY t2.x