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PREPARE s FROM "ALTER TABLE t modify b TEXT CHARACTER SET utf8 DEFAULT '' ";
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SET @@character_set_collations='';
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EXECUTE s;
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Leads to:
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11.2.0 e81fa345020ec6a067583db6a7019d6404b26f93 (Optimized)
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Core was generated by `/test/MD270723-mariadb-11.2.0-linux-x86_64-opt/bin/mariadbd --no-defaults --cor'.
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Program terminated with signal SIGSEGV, Segmentation fault.
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#0 Reprepare_observer::report_error (this=0x0, thd=<optimized out>)
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at /test/11.2_opt/sql/sql_prepare.cc:3808
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[Current thread is 1 (Thread 0x14f500088700 (LWP 3371857))]
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(gdb) bt
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#0 Reprepare_observer::report_error (this=0x0, thd=<optimized out>) at /test/11.2_opt/sql/sql_prepare.cc:3808
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#1 0x0000560e602cf83b in Prepared_statement::check_charset_collation_map_version (this=0x14f4a4016948, this=0x14f4a4016948, observer=<optimized out>, thd=<optimized out>) at /test/11.2_opt/sql/sql_prepare.cc:238
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#2 Prepared_statement::execute (this=0x14f4a4016948, expanded_query=0x14f500086e00, open_cursor=false) at /test/11.2_opt/sql/sql_prepare.cc:4898
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#3 0x0000560e602cfb65 in Prepared_statement::execute_loop (this=this@entry=0x14f4a4016948, expanded_query=expanded_query@entry=0x14f500086e00, open_cursor=open_cursor@entry=false, packet=packet@entry=0x0, packet_end=packet_end@entry=0x0) at /test/11.2_opt/sql/sql_prepare.cc:4433
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#4 0x0000560e602cfe7b in mysql_sql_stmt_execute (thd=thd@entry=0x14f4a4000c58) at /test/11.2_opt/sql/sql_prepare.cc:3470
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#5 0x0000560e602af911 in mysql_execute_command (thd=0x14f4a4000c58, is_called_from_prepared_stmt=<optimized out>) at /test/11.2_opt/sql/sql_parse.cc:3960
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#6 0x0000560e6029e1e5 in mysql_parse (rawbuf=<optimized out>, length=<optimized out>, parser_state=<optimized out>, thd=0x14f4a4000c58) at /test/11.2_opt/sql/sql_parse.cc:7800
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#7 mysql_parse (thd=0x14f4a4000c58, rawbuf=<optimized out>, length=<optimized out>, parser_state=<optimized out>) at /test/11.2_opt/sql/sql_parse.cc:7722
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#8 0x0000560e602aa092 in dispatch_command (command=COM_QUERY, thd=0x14f4a4000c58, packet=<optimized out>, packet_length=<optimized out>, blocking=<optimized out>) at /test/11.2_opt/sql/sql_class.h:1374
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#9 0x0000560e602abf7e in do_command (thd=0x14f4a4000c58, blocking=blocking@entry=true) at /test/11.2_opt/sql/sql_parse.cc:1405
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#10 0x0000560e603cb6cf in do_handle_one_connection (connect=<optimized out>, connect@entry=0x560e628f4b78, put_in_cache=put_in_cache@entry=true) at /test/11.2_opt/sql/sql_connect.cc:1445
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#11 0x0000560e603cb9bd in handle_one_connection (arg=0x560e628f4b78) at /test/11.2_opt/sql/sql_connect.cc:1347
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#12 0x000014f519530609 in start_thread (arg=<optimized out>) at pthread_create.c:477
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#13 0x000014f51911c133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
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Bug confirmed present in:
MariaDB: 11.2.0 (dbg), 11.2.0 (opt)
Bug (or feature/syntax) confirmed not present in:
MariaDB: 10.4.31 (dbg), 10.4.31 (opt), 10.5.22 (dbg), 10.5.22 (opt), 10.6.15 (dbg), 10.6.15 (opt), 10.9.8 (dbg), 10.9.8 (opt), 10.10.6 (dbg), 10.10.6 (opt), 10.11.5 (dbg), 10.11.5 (opt), 11.0.2 (dbg), 11.0.3 (dbg), 11.0.3 (opt), 11.1.2 (dbg), 11.1.2 (opt)
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