#0  0x0000555555c65dac in Static_binary_string::length (this=0x8)
    at mariadb-10.4.7/sql/sql_string.h:194
#1  0x0000555555e505c4 in sortcmp (s=0x0, t=0x7fff2403fdc8, 
    cs=0x5555573b41c0 <my_charset_utf8_general_ci>)
    at mariadb-10.4.7/sql/sql_string.cc:802
#2  0x0000555555f972ef in String::eq (this=0x0, other=0x7fff2403fdc8, 
    cs=0x5555573b41c0 <my_charset_utf8_general_ci>)
    at mariadb-10.4.7/sql/sql_string.h:962
#3  0x0000555555f94ae6 in Type_handler_string_result::Item_const_eq (
    this=0x5555571e5bb8 <type_handler_string>, a=0x7fff240818f8, b=0x7fff2403fe18, 
    binary_cmp=false) at mariadb-10.4.7/sql/sql_type.cc:7882
#4  0x00005555560e1b86 in Item_basic_value::eq (this=0x7fff24081878, item=0x7fff2403fd98, 
    binary_cmp=false) at mariadb-10.4.7/sql/item.cc:3476
#5  0x00005555560e9f3e in Item::eq_by_collation (this=0x7fff24081878, item=0x7fff2403fd98, 
    binary_cmp=false, cs=0x5555573b41c0 <my_charset_utf8_general_ci>)
    at mariadb-10.4.7/sql/item.cc:6310
#6  0x0000555555dd81ff in merge_key_fields (start=0x7fff24040c60, new_fields=0x7fff24040c98, 
    end=0x7fff24040cd0, and_level=3)
    at mariadb-10.4.7/sql/sql_select.cc:5645
#7  0x0000555555dd92d1 in Item_cond::add_key_fields (this=0x7fff2403f540, join=0x7fff2403f768, 
    key_fields=0x7fff9c69c838, and_level=0x7fff9c69c828, usable_tables=18446744073709551615, 
    sargables=0x7fff9c69c998) at mariadb-10.4.7/sql/sql_select.cc:6058
#8  0x0000555555dd9176 in Item_cond_and::add_key_fields (this=0x7fff2403f418, 
    join=0x7fff2403f768, key_fields=0x7fff9c69c838, and_level=0x7fff9c69c828, 
    usable_tables=18446744073709551615, sargables=0x7fff9c69c998)
    at mariadb-10.4.7/sql/sql_select.cc:6033
#9  0x0000555555ddb427 in update_ref_and_keys (thd=0x7fff24038e60, keyuse=0x7fff2403fa58, 
    join_tab=0x7fff240401f0, tables=1, cond=0x7fff2403f418, 
    normal_tables=18446744073709551615, select_lex=0x7fff2407f950, sargables=0x7fff9c69c998)
    at mariadb-10.4.7/sql/sql_select.cc:6714
#10 0x0000555555dd5b72 in make_join_statistics (join=0x7fff2403f768, tables_list=..., 
    keyuse_array=0x7fff2403fa58)
    at mariadb-10.4.7/sql/sql_select.cc:4985
#11 0x0000555555dcbf16 in JOIN::optimize_inner (this=0x7fff2403f768)
    at mariadb-10.4.7/sql/sql_select.cc:2194
#12 0x0000555555dc9ba8 in JOIN::optimize (this=0x7fff2403f768)
    at mariadb-10.4.7/sql/sql_select.cc:1563
#13 0x0000555555dd48c9 in mysql_select (thd=0x7fff24038e60, tables=0x7fff24080b60, wild_num=0, 
    fields=..., conds=0x7fff2403f418, og_num=2, order=0x7fff24082970, group=0x0, having=0x0, 
    proc_param=0x0, select_options=2416184064, result=0x7fff240833a0, unit=0x7fff2407dcb0, 
    select_lex=0x7fff2407f950) at mariadb-10.4.7/sql/sql_select.cc:4592
#14 0x0000555555dc5143 in handle_select (thd=0x7fff24038e60, lex=0x7fff2407dbe8, 
    result=0x7fff240833a0, setup_tables_done_option=0)
    at mariadb-10.4.7/sql/sql_select.cc:413
#15 0x0000555555d8eb4f in execute_sqlcom_select (thd=0x7fff24038e60, all_tables=0x7fff24080b60)
    at mariadb-10.4.7/sql/sql_parse.cc:6356
#16 0x0000555555d849b5 in mysql_execute_command (thd=0x7fff24038e60)
    at mariadb-10.4.7/sql/sql_parse.cc:3898
#17 0x0000555555db0d63 in Prepared_statement::execute (this=0x7fff24067aa0, 
    expanded_query=0x7fff9c69df20, open_cursor=false)
    at mariadb-10.4.7/sql/sql_prepare.cc:4760
#18 0x0000555555daf325 in Prepared_statement::execute_loop (this=0x7fff24067aa0, 
    expanded_query=0x7fff9c69df20, open_cursor=false, packet=0x7fff240339ea "\t\001\376", 
    packet_end=0x7fff240339fc "")
    at mariadb-10.4.7/sql/sql_prepare.cc:4246
#19 0x0000555555dacbcf in mysql_stmt_execute_common (thd=0x7fff24038e60, stmt_id=145, 
    packet=0x7fff240339ea "\t\001\376", packet_end=0x7fff240339fc "", cursor_flags=0, 
    bulk_op=false, read_types=false)
    at mariadb-10.4.7/sql/sql_prepare.cc:3255
#20 0x0000555555dac772 in mysqld_stmt_execute (thd=0x7fff24038e60, 
    packet_arg=0x7fff240339e1 "\221", packet_length=27)
    at mariadb-10.4.7/sql/sql_prepare.cc:3152
#21 0x0000555555d7e6c2 in dispatch_command (command=COM_STMT_EXECUTE, thd=0x7fff24038e60, 
    packet=0x7fff240339e1 "\221", packet_length=27, is_com_multi=false, is_next_command=false)
    at mariadb-10.4.7/sql/sql_parse.cc:1765
#22 0x0000555555d7d41e in do_command (thd=0x7fff24038e60)
    at mariadb-10.4.7/sql/sql_parse.cc:1359
#23 0x0000555555ef5891 in do_handle_one_connection (connect=0x55555a6db430)
    at mariadb-10.4.7/sql/sql_connect.cc:1404
#24 0x0000555555ef55e6 in handle_one_connection (arg=0x55555a6db430)
    at mariadb-10.4.7/sql/sql_connect.cc:1306
#25 0x00007ffff7f8819c in start_thread () from /lib64/libpthread.so.0
#26 0x00007ffff6f3a4af in clone () from /lib64/libc.so.6