TO_DATE: Server crash in my_uca_strnncoll_multilevel_generic

CREATE TABLE t (f ENUM('foo','bar')) COLLATE uca1400_ai_cs;

#2  <signal handler called>

#3  0x0000556e1e3d346a in my_uca_strnncoll_multilevel_generic (cs=0x556e4986fa48, s=0x7f0a50014110 "bar", slen=3, t=0x7f0a50014108 "foo", tlen=3, t_is_prefix=0x0) at /data/bld/preview-12.3/bb-12.3-MDEV-19683-to_date-rel/strings/ctype-uca.inl:154

#4  0x0000556e1dc56ae8 in charset_info_st::strnncoll (b_is_prefix=0x0, blen=3, b=0x7f0a50014108 "foo", alen=<optimized out>, a=<optimized out>, this=0x556e4986fa48) at /data/bld/preview-12.3/bb-12.3-MDEV-19683-to_date-rel/include/m_ctype.h:1112

#5  find_type2 (typelib=typelib@entry=0x7f0a6227ddd0, x=0x7f0a50014108 "foo", length=3, part_match=part_match@entry=false, cs=cs@entry=0x556e4986fa48) at /data/bld/preview-12.3/bb-12.3-MDEV-19683-to_date-rel/sql/strfunc.cc:179

#6  0x0000556e1dc188cb in check_duplicates_in_interval (set_or_name=set_or_name@entry=0x556e1e5edba6 "ENUM", name=<optimized out>, typelib=<optimized out>, cs=0x556e4986fa48, dup_val_count=dup_val_count@entry=0x7f0a6227e07c) at /data/bld/preview-12.3/bb-12.3-MDEV-19683-to_date-rel/sql/sql_table.cc:2321

#7  0x0000556e1dc18b73 in Column_definition::prepare_stage2_typelib (this=<optimized out>, type_name=type_name@entry=0x556e1e5edba6 "ENUM", field_flags=field_flags@entry=256, dup_val_count=dup_val_count@entry=0x7f0a6227e07c) at /data/bld/preview-12.3/bb-12.3-MDEV-19683-to_date-rel/sql/sql_table.cc:2393

#8  0x0000556e1dd38090 in Type_handler_enum::Column_definition_prepare_stage2 (this=<optimized out>, def=<optimized out>, file=<optimized out>, table_flags=<optimized out>) at /data/bld/preview-12.3/bb-12.3-MDEV-19683-to_date-rel/sql/sql_type.cc:3367

#9  0x0000556e1dc18be1 in Column_definition::prepare_stage2 (this=0x7f0a50013dd0, file=<optimized out>, table_flags=<optimized out>) at /data/bld/preview-12.3/bb-12.3-MDEV-19683-to_date-rel/sql/sql_table.cc:2436

#10 0x0000556e1dc19c12 in mysql_prepare_create_table_finalize (thd=thd@entry=0x7f0a50000c68, create_info=create_info@entry=0x7f0a6227f320, alter_info=alter_info@entry=0x7f0a6227f020, db_options=db_options@entry=0x7f0a6227e2e8, file=file@entry=0x7f0a50014118, key_info_buffer=key_info_buffer@entry=0x7f0a6227ec48, key_count=<optimized out>, create_table_mode=<optimized out>) at /data/bld/preview-12.3/bb-12.3-MDEV-19683-to_date-rel/sql/handler.h:3612

#11 0x0000556e1dc1db7b in mysql_create_frm_image (thd=thd@entry=0x7f0a50000c68, create_info=create_info@entry=0x7f0a6227f320, alter_info=<optimized out>, create_table_mode=create_table_mode@entry=0, key_info=key_info@entry=0x7f0a6227ec48, key_count=key_count@entry=0x7f0a6227ec44, frm=<optimized out>) at /data/bld/preview-12.3/bb-12.3-MDEV-19683-to_date-rel/sql/sql_table.cc:4598

#12 0x0000556e1dc22118 in create_table_impl (thd=thd@entry=0x7f0a50000c68, ddl_log_state_create=ddl_log_state_create@entry=0x7f0a6227ef80, ddl_log_state_rm=<optimized out>, ddl_log_state_rm@entry=0x7f0a6227f1a0, orig_db=..., orig_table_name=..., db=..., table_name=..., path=..., options=..., create_info=<optimized out>, alter_info=<optimized out>, create_table_mode=<optimized out>, is_trans=<optimized out>, key_info=<optimized out>, key_count=<optimized out>, frm=<optimized out>) at /data/bld/preview-12.3/bb-12.3-MDEV-19683-to_date-rel/sql/sql_table.cc:4927

#13 0x0000556e1dc22d9c in mysql_create_table_no_lock (thd=thd@entry=0x7f0a50000c68, ddl_log_state_create=ddl_log_state_create@entry=0x7f0a6227ef80, ddl_log_state_rm=ddl_log_state_rm@entry=0x7f0a6227f1a0, create_info=create_info@entry=0x7f0a6227f320, alter_info=alter_info@entry=0x7f0a6227f020, is_trans=is_trans@entry=0x7f0a6227ef40, create_table_mode=<optimized out>, table_list=<optimized out>) at /data/bld/preview-12.3/bb-12.3-MDEV-19683-to_date-rel/sql/sql_table.cc:5052

#14 0x0000556e1dc282f8 in mysql_create_table (alter_info=0x7f0a6227f020, create_info=0x7f0a6227f320, create_table=0x7f0a500134e8, thd=0x7f0a50000c68) at /data/bld/preview-12.3/bb-12.3-MDEV-19683-to_date-rel/sql/sql_table.cc:5298

#15 Sql_cmd_create_table_like::execute (this=<optimized out>, thd=0x7f0a50000c68) at /data/bld/preview-12.3/bb-12.3-MDEV-19683-to_date-rel/sql/sql_table.cc:13793

#16 0x0000556e1db5e966 in mysql_execute_command (thd=thd@entry=0x7f0a50000c68, is_called_from_prepared_stmt=is_called_from_prepared_stmt@entry=false) at /data/bld/preview-12.3/bb-12.3-MDEV-19683-to_date-rel/sql/sql_parse.cc:5861

#17 0x0000556e1db63036 in mysql_parse (thd=0x7f0a50000c68, rawbuf=<optimized out>, length=<optimized out>, parser_state=<optimized out>) at /data/bld/preview-12.3/bb-12.3-MDEV-19683-to_date-rel/sql/sql_parse.cc:7895

#18 0x0000556e1db653bd in dispatch_command (command=command@entry=COM_QUERY, thd=thd@entry=0x7f0a50000c68, packet=packet@entry=0x7f0a50008a39 "CREATE TABLE t (f ENUM('foo','bar')) COLLATE uca1400_ai_cs", packet_length=packet_length@entry=58, blocking=blocking@entry=true) at /data/bld/preview-12.3/bb-12.3-MDEV-19683-to_date-rel/sql/sql_parse.cc:1977

#19 0x0000556e1db6706f in do_command (thd=thd@entry=0x7f0a50000c68, blocking=blocking@entry=true) at /data/bld/preview-12.3/bb-12.3-MDEV-19683-to_date-rel/sql/sql_parse.cc:1417

#20 0x0000556e1dc99105 in do_handle_one_connection (connect=<optimized out>, connect@entry=0x556e49f21158, put_in_cache=put_in_cache@entry=true) at /data/bld/preview-12.3/bb-12.3-MDEV-19683-to_date-rel/sql/sql_connect.cc:1503

#21 0x0000556e1dc9945d in handle_one_connection (arg=arg@entry=0x556e49f21158) at /data/bld/preview-12.3/bb-12.3-MDEV-19683-to_date-rel/sql/sql_connect.cc:1415

#22 0x0000556e1e08fc2c in pfs_spawn_thread (arg=0x556e49ed4b38) at /data/bld/preview-12.3/bb-12.3-MDEV-19683-to_date-rel/storage/perfschema/pfs.cc:2198

#23 0x00007f0a68ca81c4 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:442

#24 0x00007f0a68d2885c in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81

commit 9c71ee6df2f564e4d71e6af8200d95b62ef49904

Author: Monty

Date:   Tue Jan 13 19:47:07 2026 +0200

    Add detection of partial matches for strnncoll

    This is achived by changing the 'is_prefix' parameter to strncoll