The problem was found during RQG testing on MariaDB 10.4 30641f9df77be99d93524e39cdc2b2d783e6d3e1 2018-12-18

compiled with debug.

There was no replay of the assert on actual 10.2 and 10.3.

ts_3.test

--------------

--source include/have_innodb.inc

CREATE TABLE t1 (col2 INT, col_int INTEGER) ENGINE = InnoDB ROW_FORMAT = Redundant  ;

ALTER TABLE t1 ADD UNIQUE INDEX IF NOT EXISTS `uidx3` ( col2 )  ;

ALTER TABLE t1 ADD PRIMARY KEY ( col_int, col2 ) ;

ALTER TABLE t1 ADD UNIQUE INDEX `uidx2` ( col_int ) ;

ALTER TABLE t1 DROP PRIMARY KEY  ;

ALTER TABLE t1 CHANGE COLUMN col2 col2 INT ;

DELETE FROM t1 WHERE col2 = NULL OR col2 IS NULL;

SHOW PROCESSLIST;

...

Version: '10.4.1-MariaDB-debug-log'  socket: 'bld_debug/mysql-test/var/tmp/mysqld.1.sock'  port: 16000  Source distribution

2018-12-19 15:34:42 0x7f365a76c700  InnoDB: Assertion failure in file storage/innobase/row/row0sel.cc line 2549

InnoDB: Failing assertion: field->col->mtype == type

....

Query (0x7f3604014190): DELETE FROM t1 WHERE col2 = NULL OR col2 IS NULL

Connection ID (thread ID): 9

Status: NOT_KILLED

...

Thread 1 (Thread 0x7f365a76c700 (LWP 1205)):

#0  __pthread_kill (threadid=<optimized out>, signo=6) at ../sysdeps/unix/sysv/linux/pthread_kill.c:57

#1  0x000055d4a5055b94 in my_write_core (sig=6) at mysys/stacktrace.c:481

#2  0x000055d4a489bca3 in handle_fatal_signal (sig=6) at sql/signal_handler.cc:305

#3  <signal handler called>

#4  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51

#5  0x00007f3665479f5d in __GI_abort () at abort.c:90

#6  0x000055d4a4ce16e9 in ut_dbg_assertion_failed (expr=0x55d4a53cbc8a "field->col->mtype == type", file=0x55d4a53cb558 "storage/innobase/row/row0sel.cc", line=2549) at storage/innobase/ut/ut0dbg.cc:60

#7  0x000055d4a4c5b536 in row_sel_convert_mysql_key_to_innobase (tuple=0x7f36040662f8, buf=0x7f3604044acc "\217\217\217\217", buf_len=4, index=0x7f3604180da8, key_ptr=0x7f36040652ec "", key_len=5) at storage/innobase/row/row0sel.cc:2549

#8  0x000055d4a4ac8147 in ha_innobase::records_in_range (this=0x7f360417a3c0, keynr=1, min_key=0x7f365a7692a0, max_key=0x7f365a7692c0) at storage/innobase/handler/ha_innodb.cc:13439

#9  0x000055d4a47421e9 in handler::multi_range_read_info_const (this=0x7f360417a3c0, keyno=1, seq=0x7f365a769440, seq_init_param=0x7f365a769470, n_ranges_arg=0, bufsz=0x7f365a769344, flags=0x7f365a769340, cost=0x7f365a769a70) at sql/multi_range_read.cc:108

#10 0x000055d4a4745664 in DsMrr_impl::dsmrr_info_const (this=0x7f360417a808, keyno=1, seq=0x7f365a769440, seq_init_param=0x7f365a769470, n_ranges=0, bufsz=0x7f365a769a00, flags=0x7f365a7699fc, cost=0x7f365a769a70) at sql/multi_range_read.cc:1461

#11 0x000055d4a4ad2de2 in ha_innobase::multi_range_read_info_const (this=0x7f360417a3c0, keyno=1, seq=0x7f365a769440, seq_init_param=0x7f365a769470, n_ranges=0, bufsz=0x7f365a769a00, flags=0x7f365a7699fc, cost=0x7f365a769a70) at storage/innobase/handler/ha_innodb.cc:20366

#12 0x000055d4a4a12d8e in check_quick_select (param=0x7f365a769c30, idx=1, index_only=false, tree=0x7f3604065408, update_tbl_stats=true, mrr_flags=0x7f365a7699fc, bufsize=0x7f365a769a00, cost=0x7f365a769a70) at sql/opt_range.cc:10590

#13 0x000055d4a4a09967 in get_key_scans_params (param=0x7f365a769c30, tree=0x7f3604065380, index_read_must_be_used=false, update_tbl_stats=true, read_time=3.3000000000000003) at sql/opt_range.cc:6926

#14 0x000055d4a4a0018d in SQL_SELECT::test_quick_select (this=0x7f36040152a0, thd=0x7f3604000ce8, keys_to_use=..., prev_tables=0, limit=18446744073709551615, force_quick_range=false, ordered_output=false, remove_false_parts_of_where=false) at sql/opt_range.cc:2704

#15 0x000055d4a4691ebc in SQL_SELECT::check_quick (this=0x7f36040152a0, thd=0x7f3604000ce8, force_quick_range=false, limit=18446744073709551615) at sql/opt_range.h:1648

#16 0x000055d4a4a44807 in mysql_delete (thd=0x7f3604000ce8, table_list=0x7f36040142a0, conds=0x7f3604014ea0, order_list=0x7f3604005590, limit=18446744073709551615, options=0, result=0x0) at sql/sql_delete.cc:502

#17 0x000055d4a45927bc in mysql_execute_command (thd=0x7f3604000ce8) at sql/sql_parse.cc:4925

#18 0x000055d4a459ca8c in mysql_parse (thd=0x7f3604000ce8, rawbuf=0x7f3604014190 "DELETE FROM t1 WHERE col2 = NULL OR col2 IS NULL", length=48, parser_state=0x7f365a76b5f0, is_com_multi=false, is_next_command=false) at sql/sql_parse.cc:8104

#19 0x000055d4a45899ba in dispatch_command (command=COM_QUERY, thd=0x7f3604000ce8, packet=0x7f360400acd9 "DELETE FROM t1 WHERE col2 = NULL OR col2 IS NULL", packet_length=48, is_com_multi=false, is_next_command=false) at sql/sql_parse.cc:1850

#20 0x000055d4a45883cf in do_command (thd=0x7f3604000ce8) at sql/sql_parse.cc:1395

#21 0x000055d4a46f329e in do_handle_one_connection (connect=0x55d4a70e33b8) at sql/sql_connect.cc:1402

#22 0x000055d4a46f3015 in handle_one_connection (arg=0x55d4a70e33b8) at sql/sql_connect.cc:1308

#23 0x000055d4a4fedd63 in pfs_spawn_thread (arg=0x55d4a7149d08) at storage/perfschema/pfs.cc:1862

#24 0x00007f366611b7fc in start_thread (arg=0x7f365a76c700) at pthread_create.c:465

#25 0x00007f3665555b5f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95