--source include/have_innodb.inc

CREATE TABLE t1 (i INT) ENGINE=InnoDB;

SELECT ( SELECT DISTINCT GROUP_CONCAT(SLEEP(0)) FROM t1 GROUP BY i );

SELECT i FROM t1 ORDER BY i LIMIT 1;

mysqld: /data/src/10.1/sql/filesort_utils.cc:110: uchar** Filesort_buffer::alloc_sort_buffer(uint, uint): Assertion `num_records == m_idx_array.size()' failed.

161027 18:14:48 [ERROR] mysqld got signal 6 ;

#6  0x00007f2cdb1c8266 in __assert_fail_base (fmt=0x7f2cdb301238 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=assertion@entry=0x7f2cde3e0b48 "num_records == m_idx_array.size()", file=file@entry=0x7f2cde3e0ae0 "/data/src/10.1/sql/filesort_utils.cc", line=line@entry=110, function=function@entry=0x7f2cde3e0ba0 <Filesort_buffer::alloc_sort_buffer(unsigned int, unsigned int)::__PRETTY_FUNCTION__> "uchar** Filesort_buffer::alloc_sort_buffer(uint, uint)") at assert.c:92

#7  0x00007f2cdb1c8312 in __GI___assert_fail (assertion=0x7f2cde3e0b48 "num_records == m_idx_array.size()", file=0x7f2cde3e0ae0 "/data/src/10.1/sql/filesort_utils.cc", line=110, function=0x7f2cde3e0ba0 <Filesort_buffer::alloc_sort_buffer(unsigned int, unsigned int)::__PRETTY_FUNCTION__> "uchar** Filesort_buffer::alloc_sort_buffer(uint, uint)") at assert.c:101

#8  0x00007f2cdddb1a6c in Filesort_buffer::alloc_sort_buffer (this=0x7f2cde8d1e40, num_records=2, record_length=10) at /data/src/10.1/sql/filesort_utils.cc:110

#9  0x00007f2cddc071c0 in Filesort_info::alloc_sort_buffer (this=0x7f2cde8d1e40, num_records=2, record_length=10) at /data/src/10.1/sql/table.h:354

#10 0x00007f2cddc05002 in check_if_pq_applicable (param=0x7f2cde8d1eb0, filesort_info=0x7f2cde8d1e40, table=0x7f2cc5881c70, num_rows=1129, memory_available=262144) at /data/src/10.1/sql/filesort.cc:1346

#11 0x00007f2cddc01ff9 in filesort (thd=0x7f2cd1bb2070, table=0x7f2cc5881c70, sortorder=0x7f2cc58fccc0, s_length=1, select=0x7f2cc58fc008, max_rows=1, sort_positions=false, examined_rows=0x7f2cde8d22b0, found_rows=0x7f2cde8d22b8, tracker=0x7f2cc58fcd00) at /data/src/10.1/sql/filesort.cc:224

#12 0x00007f2cdda4207a in create_sort_index (thd=0x7f2cd1bb2070, join=0x7f2cc58faac0, order=0x7f2cc58fa988, filesort_limit=1, select_limit=1, is_order_by=true) at /data/src/10.1/sql/sql_select.cc:21486

#13 0x00007f2cdda14beb in JOIN::exec_inner (this=0x7f2cc58faac0) at /data/src/10.1/sql/sql_select.cc:3185

#14 0x00007f2cdda120ad in JOIN::exec (this=0x7f2cc58faac0) at /data/src/10.1/sql/sql_select.cc:2505

#15 0x00007f2cdda1561b in mysql_select (thd=0x7f2cd1bb2070, rref_pointer_array=0x7f2cd1bb6430, tables=0x7f2cc58fa288, wild_num=0, fields=..., conds=0x0, og_num=1, order=0x7f2cc58fa988, group=0x0, having=0x0, proc_param=0x0, select_options=2147748608, result=0x7f2cc58faaa0, unit=0x7f2cd1bb5ab8, select_lex=0x7f2cd1bb61b8) at /data/src/10.1/sql/sql_select.cc:3438

#16 0x00007f2cdda0b10c in handle_select (thd=0x7f2cd1bb2070, lex=0x7f2cd1bb59f0, result=0x7f2cc58faaa0, setup_tables_done_option=0) at /data/src/10.1/sql/sql_select.cc:384

#17 0x00007f2cdd9db309 in execute_sqlcom_select (thd=0x7f2cd1bb2070, all_tables=0x7f2cc58fa288) at /data/src/10.1/sql/sql_parse.cc:5895

#18 0x00007f2cdd9d1216 in mysql_execute_command (thd=0x7f2cd1bb2070) at /data/src/10.1/sql/sql_parse.cc:2961

#19 0x00007f2cdd9dea62 in mysql_parse (thd=0x7f2cd1bb2070, rawbuf=0x7f2cc58fa088 "SELECT i FROM t1 ORDER BY i LIMIT 1", length=35, parser_state=0x7f2cde8d35e0) at /data/src/10.1/sql/sql_parse.cc:7318

#20 0x00007f2cdd9cd46b in dispatch_command (command=COM_QUERY, thd=0x7f2cd1bb2070, packet=0x7f2cd3a9b071 "SELECT i FROM t1 ORDER BY i LIMIT 1", packet_length=35) at /data/src/10.1/sql/sql_parse.cc:1487

#21 0x00007f2cdd9cc1a2 in do_command (thd=0x7f2cd1bb2070) at /data/src/10.1/sql/sql_parse.cc:1108

#22 0x00007f2cddb0207d in do_handle_one_connection (thd_arg=0x7f2cd1bb2070) at /data/src/10.1/sql/sql_connect.cc:1350

#23 0x00007f2cddb01de1 in handle_one_connection (arg=0x7f2cd1bb2070) at /data/src/10.1/sql/sql_connect.cc:1262

#24 0x00007f2cddde4aba in pfs_spawn_thread (arg=0x7f2cd3ab8bf0) at /data/src/10.1/storage/perfschema/pfs.cc:1860

#25 0x00007f2cdd0ca0a4 in start_thread (arg=0x7f2cde8d4b00) at pthread_create.c:309

#26 0x00007f2cdb28287d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111