diff options
Diffstat (limited to 'sql/sys_vars.cc')
| -rw-r--r-- | sql/sys_vars.cc | 22 |
1 files changed, 18 insertions, 4 deletions
diff --git a/sql/sys_vars.cc b/sql/sys_vars.cc index b1d2b4919f2..47138046ab4 100644 --- a/sql/sys_vars.cc +++ b/sql/sys_vars.cc @@ -792,12 +792,26 @@ static bool check_charset(sys_var *self, THD *thd, set_var *var) { int csno= (int)var->value->val_int(); CHARSET_INFO *cs; - if (!(var->save_result.ptr= cs= get_charset(csno, MYF(0))) || - !(cs->state & MY_CS_PRIMARY)) + if ((var->save_result.ptr= cs= get_charset(csno, MYF(0)))) { - my_error(ER_UNKNOWN_CHARACTER_SET, MYF(0), llstr(csno, buff)); - return true; + /* + Backward compatibility: pre MDEV-30824 servers + can write non-default collation IDs to binary log: + SET character_set_client=83; -- utf8mb3_bin + Convert a non-default collation to the compiled default collation, + e.g. utf8mb3_bin to utf8mb3_general_ci, but only if + - THD is a slave thread or + - is processing a mysqlbinlog output. + */ + if ((cs->state & MY_CS_PRIMARY) || + ((thd->variables.pseudo_slave_mode || thd->slave_thread) && + (var->save_result.ptr= + Lex_exact_charset_opt_extended_collate(cs, true). + find_default_collation()))) + return false; } + my_error(ER_UNKNOWN_CHARACTER_SET, MYF(0), llstr(csno, buff)); + return true; } return false; } |