--source include/have_innodb.inc

CREATE TABLE t (a VARCHAR(40), b INT) ENGINE=InnoDB;

ALTER TABLE t MODIFY a VARCHAR(50), DROP b;

# Cleanup

DROP TABLE t;

#3  <signal handler called>

#4  0x000055a44cabf7a2 in ha_innobase::prepare_inplace_alter_table (this=0x61d000247ca8, altered_table=0x7f878da61150, ha_alter_info=0x7f878da5f3e0) at /data/src/10.4/storage/innobase/handler/handler0alter.cc:8338

#5  0x000055a44c070d95 in handler::ha_prepare_inplace_alter_table (this=0x61d000247ca8, altered_table=0x7f878da61150, ha_alter_info=0x7f878da5f3e0) at /data/src/10.4/sql/handler.cc:4672

#6  0x000055a44bb1d068 in mysql_inplace_alter_table (thd=0x62b00009a208, table_list=0x62b0000a1358, table=0x62000003c088, altered_table=0x7f878da61150, ha_alter_info=0x7f878da5f3e0, target_mdl_request=0x7f878da5f600, alter_ctx=0x7f878da60660) at /data/src/10.4/sql/sql_table.cc:7882

#7  0x000055a44bb2fc35 in mysql_alter_table (thd=0x62b00009a208, new_db=0x62b00009ea10, new_name=0x62b00009ee68, create_info=0x7f878da62250, table_list=0x62b0000a1358, recreate_info=0x7f878da620b0, alter_info=0x7f878da62150, order_num=0, order=0x0, ignore=false) at /data/src/10.4/sql/sql_table.cc:10446

#8  0x000055a44bcb66bc in Sql_cmd_alter_table::execute (this=0x62b0000a1be8, thd=0x62b00009a208) at /data/src/10.4/sql/sql_alter.cc:531

#9  0x000055a44b8bfe35 in mysql_execute_command (thd=0x62b00009a208) at /data/src/10.4/sql/sql_parse.cc:6216

#10 0x000055a44b8cb6af in mysql_parse (thd=0x62b00009a208, rawbuf=0x62b0000a1228 "ALTER TABLE t MODIFY a VARCHAR(50), DROP b", length=42, parser_state=0x7f878da64860, is_com_multi=false, is_next_command=false) at /data/src/10.4/sql/sql_parse.cc:8010

#11 0x000055a44b8a197a in dispatch_command (command=COM_QUERY, thd=0x62b00009a208, packet=0x62900029e209 "ALTER TABLE t MODIFY a VARCHAR(50), DROP b", packet_length=42, is_com_multi=false, is_next_command=false) at /data/src/10.4/sql/sql_parse.cc:1857

#12 0x000055a44b89e4e9 in do_command (thd=0x62b00009a208) at /data/src/10.4/sql/sql_parse.cc:1378

#13 0x000055a44bc9da48 in do_handle_one_connection (connect=0x608000000ba8) at /data/src/10.4/sql/sql_connect.cc:1420

#14 0x000055a44bc9d35f in handle_one_connection (arg=0x608000000ba8) at /data/src/10.4/sql/sql_connect.cc:1324

#15 0x000055a44c90cdd4 in pfs_spawn_thread (arg=0x615000006208) at /data/src/10.4/storage/perfschema/pfs.cc:1869

#16 0x00007f87a26a7fd4 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:442

#17 0x00007f87a27285bc in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81

commit 5f09b53bdb4e973e7c7ec2c53a24c98321223f98 423c28f0aa47df796ac4eda5a2288b9fd12d5d31

Author:     Thirunarayanan Balathandayuthapani

AuthorDate: Mon Jun 5 19:09:38 2023 +0530

CommitDate: Tue Jun 27 16:58:22 2023 +0530

    MDEV-31086 MODIFY COLUMN can break FK constraints, and lead to unrestorable dumps