MDEV-24746 Atomic CREATE TRIGGER

The purpose of this task is to ensure that CREATE TRIGGER is atomic

When a trigger is created, we first create a trigger_name.TRN file and then
create or update the table_name.TRG files.
This is done by creating .TRN~ and .TRG~ files and replacing (or creating)
the result files.

The new logic is

- Log CREATE TRIGGER to DDL log, with a marker if old trigger existsted
- If old .TRN or .TRG files exists, make backup copies of these
- Create the new .TRN and .TRG files as before
- Remove the backups

Crash recovery
- If query has been logged to binary log:
  - delete any left over backup files
- else
   - Delete any old .TRN~ or .TRG~ files
   - If there was orignally some triggers (old .TRG file existed)
      - If we crashed before creating all backup files
         - Delete existing backup files
      - else
         - Restore backup files
      - end
   - Delete .TRN and .TRG file (as there was no triggers before

One benefit of the new code is that CREATE OR REPLACE TRIGGER is now
totally atomic even if there existed an old trigger: Either the old
trigger will be replaced or the old one will be left untouched.

Other things:
- If sql_create_definition_file() would fail, there could be memory leaks
  in CREATE TRIGGER, DROP TRIGGER or CREATE OR REPLACE TRIGGER.  This
  is now fixed.

mysql-test/suite/atomic/README.txt

+To debug a the ddl_recovery code in a failing ddl_recovery test one could do
+the following:
+
+- Add # before --exec echo "restart" ...
+- Force $e (engine), $c (crash point) and $r (crash position) to the values
+  where things goes wrong. See comments in alter_table.test for how to do this.
+- start mariadbd in a debugger
+
+run the following in the debugger
+(Replace 'atomic.create_trigger' with the failing test case)
+
+#break ha_recover
+#break MYSQL_BIN_LOG::recover
+#break MYSQL_BIN_LOG::open
+
+break ddl_log_close_binlogged_events
+break ddl_log_execute_action
+break ddl_log_execute_recovery
+run --datadir=/my/maria-10.6/mysql-test/var/log/atomic.create_trigger/mysqld.1/data --log-basename=master --log-bin-index=mysqld-bin.index --debug --log-bin

mysql-test/suite/atomic/create_trigger.test

+--source include/have_debug.inc
+--source include/have_log_bin.inc
+--source include/not_valgrind.inc
+
+#
+# Testing of atomic CREATE TRIGGER with crashes in a lot of different places
+#
+
+let $MYSQLD_DATADIR= `SELECT @@datadir`;
+
+let $engine_count=1;
+let $engines='aria';
+
+let $crash_count=6;
+let $crash_points='ddl_log_create_before_create_trigger', 'ddl_log_create_after_create_trigger', 'definition_file_after_create', 'ddl_log_drop_before_binlog', 'ddl_log_drop_after_binlog','ddl_log_drop_before_delete_tmp';
+
+let $old_debug=`select @@debug_dbug`;
+
+let $e=0;
+let $keep_include_silent=1;
+let $grep_script=CREATE.*TRIGGER;
+let $drops=3;
+--disable_query_log
+
+while ($e < $engine_count)
+{
+  inc $e;
+  let $engine=`select ELT($e, $engines)`;
+  let $default_engine=$engine;
+  let $extra_option=;
+
+  if ($engine == "aria")
+  {
+    let $extra_option=transactional=1;
+  }
+  if ($engine == "aria_notrans")
+  {
+    let $default_engine="aria";
+    let $extra_option=transactional=0;
+  }
+  --eval set @@default_storage_engine=$default_engine
+  --eval create table t1 (a int not null, b int not null) $extra_option;
+  insert into t1 values(1,1);
+  flush tables;
+
+  let $c=0;
+  while ($c < $crash_count)
+  {
+    inc $c;
+    let $crash=`select ELT($c, $crash_points)`;
+    let $r=0;
+    while ($r < $drops)
+    {
+      inc $r;
+
+      RESET MASTER;
+
+      echo "engine: $engine  crash point: $crash  position: $r";
+      --exec echo "restart" > $MYSQLTEST_VARDIR/tmp/mysqld.1.expect
+      --disable_reconnect
+      --eval set @@debug_dbug="+d,$crash",@debug_crash_counter=$r
+      let $errno=0;
+      delimiter |;
+      --error 0,2013
+      CREATE TRIGGER t1_trg before insert on t1 for each row
+      begin
+        if isnull(new.a) then
+          set new.a:= 1000;
+        end if;
+      end|
+      delimiter ;|
+      let $error=$errno;
+      if ($error == 0)
+      {
+        delimiter |;
+        --error 0,2013
+        CREATE OR REPLACE TRIGGER t2_trg before insert on t1 for each row
+        begin
+          if isnull(new.b) then
+            set new.b:= 2000;
+          end if;
+        end|
+        delimiter ;|
+        let $error=$errno;
+      }
+      if ($error == 0)
+      {
+        delimiter |;
+        --error 0,2013
+        CREATE OR REPLACE TRIGGER t2_trg before insert on t1 for each row
+        begin
+          if isnull(new.b) then
+            set new.b:= 3000;
+          end if;
+        end|
+        delimiter ;|
+        let $error=$errno;
+      }
+      --enable_reconnect
+      --source include/wait_until_connected_again.inc
+      --disable_query_log
+      --eval set @@debug_dbug="$old_debug"
+
+      if ($error == 0)
+      {
+        echo "No crash!";
+      }
+      # Check which tables still exists
+      --list_files $MYSQLD_DATADIR/test *TR*
+      --list_files $MYSQLD_DATADIR/test *sql*
+
+      --replace_column 7 #
+      --error 0,ER_TRG_DOES_NOT_EXIST
+      SHOW CREATE TRIGGER t1_trg;
+      --replace_column 7 #
+      --error 0,ER_TRG_DOES_NOT_EXIST
+      SHOW CREATE TRIGGER t2_trg;
+
+      --let $binlog_file=master-bin.000001
+      --source include/show_binlog_events.inc
+      --disable_warnings
+      drop trigger if exists t1_trg;
+      drop trigger if exists t2_trg;
+      --enable_warnings
+    }
+  }
+}
+
+drop table t1;
+
+--enable_query_log

mysql-test/suite/atomic/create_trigger2.result

+"position: 1"
+"position: 2"
+"position: 3"
+t1.TRG
+t1_trg.TRN
+Trigger	sql_mode	SQL Original Statement	character_set_client	collation_connection	Database Collation	Created
+t1_trg	STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION	CREATE DEFINER=`root`@`localhost` trigger t1_trg before insert on t1 for each row
+begin
+if isnull(new.a) then
+set new.a:= 1000;
+end if;
+end	latin1	latin1_swedish_ci	latin1_swedish_ci	#
+"position: 4"
+t1.TRG
+t1_trg.TRN
+Trigger	sql_mode	SQL Original Statement	character_set_client	collation_connection	Database Collation	Created
+t1_trg	STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION	CREATE DEFINER=`root`@`localhost` trigger t1_trg before insert on t1 for each row
+begin
+if isnull(new.a) then
+set new.a:= 1000;
+end if;
+end	latin1	latin1_swedish_ci	latin1_swedish_ci	#
+"position: 5"
+t1.TRG
+t1_trg.TRN
+t2_trg.TRN
+Trigger	sql_mode	SQL Original Statement	character_set_client	collation_connection	Database Collation	Created
+t1_trg	STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION	CREATE DEFINER=`root`@`localhost` trigger t1_trg before insert on t1 for each row
+begin
+if isnull(new.a) then
+set new.a:= 1000;
+end if;
+end	latin1	latin1_swedish_ci	latin1_swedish_ci	#
+Trigger	sql_mode	SQL Original Statement	character_set_client	collation_connection	Database Collation	Created
+t2_trg	STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION	CREATE DEFINER=`root`@`localhost` trigger t2_trg before insert on t1 for each row
+begin
+if isnull(new.b) then
+set new.b:= 2000;
+end if;
+end	latin1	latin1_swedish_ci	latin1_swedish_ci	#
+"position: 6"
+t1.TRG
+t1_trg.TRN
+t2_trg.TRN
+Trigger	sql_mode	SQL Original Statement	character_set_client	collation_connection	Database Collation	Created
+t1_trg	STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION	CREATE DEFINER=`root`@`localhost` trigger t1_trg before insert on t1 for each row
+begin
+if isnull(new.a) then
+set new.a:= 1000;
+end if;
+end	latin1	latin1_swedish_ci	latin1_swedish_ci	#
+Trigger	sql_mode	SQL Original Statement	character_set_client	collation_connection	Database Collation	Created
+t2_trg	STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION	CREATE DEFINER=`root`@`localhost` trigger t2_trg before insert on t1 for each row
+begin
+if isnull(new.b) then
+set new.b:= 2000;
+end if;
+end	latin1	latin1_swedish_ci	latin1_swedish_ci	#
+"position: 7"
+t1.TRG
+t1_trg.TRN
+t2_trg.TRN
+Trigger	sql_mode	SQL Original Statement	character_set_client	collation_connection	Database Collation	Created
+t1_trg	STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION	CREATE DEFINER=`root`@`localhost` trigger t1_trg before insert on t1 for each row
+begin
+if isnull(new.a) then
+set new.a:= 1000;
+end if;
+end	latin1	latin1_swedish_ci	latin1_swedish_ci	#
+Trigger	sql_mode	SQL Original Statement	character_set_client	collation_connection	Database Collation	Created
+t2_trg	STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION	CREATE DEFINER=`root`@`localhost` trigger t2_trg before insert on t1 for each row
+begin
+if isnull(new.b) then
+set new.b:= 2000;
+end if;
+end	latin1	latin1_swedish_ci	latin1_swedish_ci	#
+"position: 8"
+t1.TRG
+t1_trg.TRN
+t2_trg.TRN
+Trigger	sql_mode	SQL Original Statement	character_set_client	collation_connection	Database Collation	Created
+t1_trg	STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION	CREATE DEFINER=`root`@`localhost` trigger t1_trg before insert on t1 for each row
+begin
+if isnull(new.a) then
+set new.a:= 1000;
+end if;
+end	latin1	latin1_swedish_ci	latin1_swedish_ci	#
+Trigger	sql_mode	SQL Original Statement	character_set_client	collation_connection	Database Collation	Created
+t2_trg	STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION	CREATE DEFINER=`root`@`localhost` trigger t2_trg before insert on t1 for each row
+begin
+if isnull(new.b) then
+set new.b:= 3000;
+end if;
+end	latin1	latin1_swedish_ci	latin1_swedish_ci	#

mysql-test/suite/atomic/create_trigger2.test

+--source include/have_debug.inc
+
+#
+# Testing of atomic CREATE TRIGGER when write fails in create_definition_file
+#
+
+let $MYSQLD_DATADIR= `SELECT @@datadir`;
+
+let $engine_count=1;
+let $engines='aria';
+let $old_debug=`select @@debug_dbug`;
+
+let $e=0;
+--disable_query_log
+
+create table t1 (a int not null, b int not null);
+insert into t1 values(1,1);
+flush tables;
+
+# sql_create_definition_file is called twice per CREATE TRIGGER and 1 more
+# in case we drop an existing trigger, so we need to test 3*2 +1 failures
+# and also when there is no failures (= 8)
+let $try_count=8;
+
+let $r=0;
+while ($r < $try_count)
+{
+  inc $r;
+
+  echo "position: $r";
+  --eval set @@debug_dbug="+d,definition_file_simulate_write_error",@debug_error_counter=$r;
+  let $errno=0;
+  delimiter |;
+  --error 0,3
+  create trigger t1_trg before insert on t1 for each row
+  begin
+    if isnull(new.a) then
+      set new.a:= 1000;
+    end if;
+  end|
+  delimiter ;|
+  let $error=$errno;
+  if ($error == 0)
+  {
+    delimiter |;
+    --error 0,3
+    create or replace trigger t2_trg before insert on t1 for each row
+    begin
+      if isnull(new.b) then
+        set new.b:= 2000;
+      end if;
+    end|
+    delimiter ;|
+    let $error=$errno;
+  }
+  if ($error == 0)
+  {
+    delimiter |;
+    --error 0,3
+    create or replace trigger t2_trg before insert on t1 for each row
+    begin
+      if isnull(new.b) then
+        set new.b:= 3000;
+      end if;
+    end|
+    delimiter ;|
+    let $error=$errno;
+  }
+  --eval set @@debug_dbug="$old_debug"
+
+  # Check which tables still exists
+  --list_files $MYSQLD_DATADIR/test *TR*
+  --list_files $MYSQLD_DATADIR/test *sql*
+
+  --replace_column 7 #
+  --error 0,ER_TRG_DOES_NOT_EXIST
+  SHOW CREATE TRIGGER t1_trg;
+  --replace_column 7 #
+  --error 0,ER_TRG_DOES_NOT_EXIST
+  SHOW CREATE TRIGGER t2_trg;
+  --disable_warnings
+  drop trigger if exists t1_trg;
+  drop trigger if exists t2_trg;
+  --enable_warnings
+}
+
+drop table t1;
+
+--enable_query_log

sql/ddl_log.cc

@@ -90,7 +90,7 @@ const char *ddl_log_action_name[DDL_LOG_LAST_ACTION]=
   "rename table", "rename view",
   "initialize drop table", "drop table",
   "drop view", "drop trigger", "drop db", "create table", "create view",
-  "delete tmp file",
+  "delete tmp file", "create trigger",
 };
 
 /* Number of phases per entry */
@@ -100,7 +100,7 @@ const uchar ddl_log_entry_phases[DDL_LOG_LAST_ACTION]=
   (uchar) EXCH_PHASE_END, (uchar) DDL_RENAME_PHASE_END, 1, 1,
   (uchar) DDL_DROP_PHASE_END, 1, 1,
   (uchar) DDL_DROP_DB_PHASE_END, (uchar) DDL_CREATE_TABLE_PHASE_END,
-  (uchar) DDL_CREATE_VIEW_PHASE_END, 0,
+  (uchar) DDL_CREATE_VIEW_PHASE_END, 0, (uchar) DDL_CREATE_TRIGGER_PHASE_END,
 };
 
 
@@ -1637,7 +1637,96 @@ static int ddl_log_execute_action(THD *thd, MEM_ROOT *mem_root,
     (void) update_phase(entry_pos, DDL_LOG_FINAL_PHASE);
     break;
   }
+  case DDL_LOG_CREATE_TRIGGER_ACTION:
+  {
+    LEX_CSTRING db, table, trigger;
+    db=      ddl_log_entry->db;
+    table=   ddl_log_entry->name;
+    trigger= ddl_log_entry->tmp_name;
+
+    /* Delete backup .TRG (trigger file) if it exists */
+    (void) build_filename_and_delete_tmp_file(to_path, sizeof(to_path) - 1,
+                                              &db, &table,
+                                              TRG_EXT,
+                                              key_file_fileparser);
+    (void) build_filename_and_delete_tmp_file(to_path, sizeof(to_path) - 1,
+                                              &db, &trigger,
+                                              TRN_EXT,
+                                              key_file_fileparser);
+    switch (ddl_log_entry->phase) {
+    case DDL_CREATE_TRIGGER_PHASE_DELETE_COPY:
+    {
+      size_t length;
+      /* Delete copy of .TRN and .TRG files */
+      length= build_table_filename(to_path, sizeof(to_path) - 1,
+                                   db.str, table.str, TRG_EXT, 0);
+      to_path[length]= '-';
+      to_path[length+1]= 0;
+      mysql_file_delete(key_file_fileparser, to_path,
+                        MYF(MY_WME|MY_IGNORE_ENOENT));
+
+      length= build_table_filename(to_path, sizeof(to_path) - 1,
+                                   db.str, trigger.str, TRN_EXT, 0);
+      to_path[length]= '-';
+      to_path[length+1]= 0;
+      mysql_file_delete(key_file_fileparser, to_path,
+                        MYF(MY_WME|MY_IGNORE_ENOENT));
+    }
+    /* Nothing else to do */
+    (void) update_phase(entry_pos, DDL_LOG_FINAL_PHASE);
     break;
+    case DDL_CREATE_TRIGGER_PHASE_OLD_COPIED:
+    {
+      LEX_CSTRING path= {to_path, 0};
+      size_t length;
+      /* Restore old version if the .TRN and .TRG files */
+      length= build_table_filename(to_path, sizeof(to_path) - 1,
+                                   db.str, table.str, TRG_EXT, 0);
+      to_path[length]='-';
+      to_path[length+1]= 0;
+      path.length= length+1;
+      /* an old TRN file only exist in the case if REPLACE was used */
+      if (!access(to_path, F_OK))
+        sql_restore_definition_file(&path);
+
+      length= build_table_filename(to_path, sizeof(to_path) - 1,
+                                   db.str, trigger.str, TRN_EXT, 0);
+      to_path[length]='-';
+      to_path[length+1]= 0;
+      path.length= length+1;
+      if (!access(to_path, F_OK))
+        sql_restore_definition_file(&path);
+      else
+      {
+        /*
+          There was originally no .TRN for this trigger.
+          Delete the newly created one.
+        */
+        to_path[length]= 0;
+        mysql_file_delete(key_file_fileparser, to_path,
+                          MYF(MY_WME|MY_IGNORE_ENOENT));
+      }
+      (void) update_phase(entry_pos, DDL_LOG_FINAL_PHASE);
+      break;
+    }
+    case DDL_CREATE_TRIGGER_PHASE_NO_OLD_TRIGGER:
+    {
+      /* No old trigger existed. We can just delete the .TRN and .TRG files */
+      build_table_filename(to_path, sizeof(to_path) - 1,
+                           db.str, table.str, TRG_EXT, 0);
+      mysql_file_delete(key_file_fileparser, to_path,
+                        MYF(MY_WME|MY_IGNORE_ENOENT));
+      build_table_filename(to_path, sizeof(to_path) - 1,
+                           db.str, trigger.str, TRN_EXT, 0);
+      mysql_file_delete(key_file_fileparser, to_path,
+                        MYF(MY_WME|MY_IGNORE_ENOENT));
+      (void) update_phase(entry_pos, DDL_LOG_FINAL_PHASE);
+      break;
+    }
+    }
+    break;
+  }
+  }
   default:
     DBUG_ASSERT(0);
     break;
@@ -2633,3 +2722,25 @@ bool ddl_log_delete_tmp_file(THD *thd, DDL_LOG_STATE *ddl_state,
     ddl_log_entry.unique_id= depending_state->execute_entry->entry_pos;
   DBUG_RETURN(ddl_log_write(ddl_state, &ddl_log_entry));
 }
+
+
+/**
+   Log CREATE TRIGGER
+*/
+
+bool ddl_log_create_trigger(THD *thd, DDL_LOG_STATE *ddl_state,
+                            const LEX_CSTRING *db, const LEX_CSTRING *table,
+                            const LEX_CSTRING *trigger_name,
+                            enum_ddl_log_create_trigger_phase phase)
+{
+  DDL_LOG_ENTRY ddl_log_entry;
+  DBUG_ENTER("ddl_log_create_view");
+
+  bzero(&ddl_log_entry, sizeof(ddl_log_entry));
+  ddl_log_entry.action_type=  DDL_LOG_CREATE_TRIGGER_ACTION;
+  ddl_log_entry.db=           *const_cast<LEX_CSTRING*>(db);
+  ddl_log_entry.name=         *const_cast<LEX_CSTRING*>(table);
+  ddl_log_entry.tmp_name=     *const_cast<LEX_CSTRING*>(trigger_name);
+  ddl_log_entry.phase=        (uchar) phase;
+  DBUG_RETURN(ddl_log_write(ddl_state, &ddl_log_entry));
+}

sql/ddl_log.h

@@ -85,6 +85,7 @@ enum ddl_log_action_code
   DDL_LOG_CREATE_TABLE_ACTION=12,
   DDL_LOG_CREATE_VIEW_ACTION=13,
   DDL_LOG_DELETE_TMP_FILE_ACTION=14,
+  DDL_LOG_CREATE_TRIGGER_ACTION=15,
   DDL_LOG_LAST_ACTION                          /* End marker */
 };
 
@@ -134,6 +135,13 @@ enum enum_ddl_log_create_view_phase {
   DDL_CREATE_VIEW_PHASE_END
 };
 
+enum enum_ddl_log_create_trigger_phase {
+  DDL_CREATE_TRIGGER_PHASE_NO_OLD_TRIGGER,
+  DDL_CREATE_TRIGGER_PHASE_DELETE_COPY,
+  DDL_CREATE_TRIGGER_PHASE_OLD_COPIED,
+  DDL_CREATE_TRIGGER_PHASE_END
+};
+
 
 /*
   Setting ddl_log_entry.phase to this has the same effect as setting
@@ -282,5 +290,9 @@ bool ddl_log_create_view(THD *thd, DDL_LOG_STATE *ddl_state,
 bool ddl_log_delete_tmp_file(THD *thd, DDL_LOG_STATE *ddl_state,
                              const LEX_CSTRING *path,
                              DDL_LOG_STATE *depending_state);
+bool ddl_log_create_trigger(THD *thd, DDL_LOG_STATE *ddl_state,
+                            const LEX_CSTRING *db, const LEX_CSTRING *table,
+                            const LEX_CSTRING *trigger_name,
+                            enum_ddl_log_create_trigger_phase phase);
 extern mysql_mutex_t LOCK_gdl;
 #endif /* DDL_LOG_INCLUDED */

sql/parse_file.cc

@@ -347,6 +347,48 @@ sql_create_definition_file(const LEX_CSTRING *dir,
   DBUG_RETURN(TRUE);
 }
 
+
+/*
+  Make a copy of a definition file with '-' added to the name
+
+  @param org_name   Original file name
+  @param new_name   Pointer to a buff of FN_REFLEN. Will be updated to name of
+                    backup file
+  @return 0 ok
+  @return 1 error
+*/
+
+int sql_backup_definition_file(const LEX_CSTRING *org_name,
+                               LEX_CSTRING *new_name)
+{
+  char *new_name_buff= (char*) new_name->str;
+  new_name->length= org_name->length+1;
+
+  memcpy(new_name_buff, org_name->str, org_name->length+1);
+  new_name_buff[org_name->length]= '-';
+  new_name_buff[org_name->length+1]= 0;
+  return my_copy(org_name->str, new_name->str, MYF(MY_WME));
+}
+
+/*
+  Restore copy of a definition file
+
+  @param org_name   Name of backup file (ending with '-' or '~')
+
+  @return 0 ok
+  @return 1 error
+*/
+
+int sql_restore_definition_file(const LEX_CSTRING *name)
+{
+  char new_name[FN_REFLEN+1];
+  memcpy(new_name, name->str, name->length-1);
+  new_name[name->length-1]= 0;
+  return mysql_file_rename(key_file_fileparser, name->str, new_name,
+                           MYF(MY_WME));
+}
+
+
 /**
   Renames a frm file (including backups) in same schema.
 

sql/parse_file.h

@@ -96,6 +96,10 @@ my_bool rename_in_schema_file(THD *thd,
                               const char *schema, const char *old_name,
                               const char *new_db, const char *new_name);
 
+int sql_backup_definition_file(const LEX_CSTRING *org_name,
+                                   LEX_CSTRING *new_name);
+int sql_restore_definition_file(const LEX_CSTRING *name);
+
 class File_parser: public Sql_alloc
 {
   char *start, *end;

sql/sql_trigger.h

@@ -220,7 +220,9 @@ class Table_triggers_list: public Sql_alloc
   }
   ~Table_triggers_list();
 
-  bool create_trigger(THD *thd, TABLE_LIST *table, String *stmt_query);
+  bool create_trigger(THD *thd, TABLE_LIST *table, String *stmt_query,
+                      DDL_LOG_STATE *ddl_log_state,
+                      DDL_LOG_STATE *ddl_log_state_tmp_file);
   bool drop_trigger(THD *thd, TABLE_LIST *table,
                     LEX_CSTRING *sp_name,
                     String *stmt_query, DDL_LOG_STATE *ddl_log_state);

sql/sql_view.cc

@@ -1178,11 +1178,8 @@ static int mysql_register_view(THD *thd, DDL_LOG_STATE *ddl_log_state,
 
   if (old_view_exists)
   {
-    /* Make a backup that we can restore in case of crash */
-    memcpy(backup_file_name, path.str, path.length);
-    backup_file_name[path.length]='-';
-    backup_file_name[path.length+1]= 0;
-    if (my_copy(path.str, backup_file_name, MYF(MY_WME)))
+    LEX_CSTRING backup_name= { backup_file_name, 0 };
+    if (sql_backup_definition_file(&path, &backup_name))
     {
       error= 1;
       goto err;