MDEV-19190 Assertion ...auto_inc_initialized failed in get_auto_increment

This is a DELETE only case. Normally this statement doesn't make inserts,
but DELETE ... FOR PORTION changes it. UPDATE and INSERT initializes
autoinc by calling handler::info(HA_STATUS_AUTO). Also myisam and innodb
can lazily initialize it in their update_create_info overrides.

The solution is to initialize autoinc during delete preparation,
if period (DELETE FOR PORTION) is specified.

The initial work has been done by Kento Takeuchi by his PR #2048,
however this commit also holds a few technical modifications by
Nikita Malyavin

mysql-test/suite/period/r/delete.result

@@ -388,3 +388,27 @@ ERROR 22003: Out of range value for column 'f' at row ROW
 delete ignore from t
 for portion of app from '2015-07-07 00:00:00' to '2020-03-11 08:48:52';
 drop table t;
+#
+# MDEV-19190 Assertion `part_share->auto_inc_initialized` failed in
+# ha_partition::get_auto_increment
+#
+create table t1 (id int, s date, e date, period for app(s,e))
+partition by key(id);
+insert into t1 (s,e) values ('2023-07-21','2024-06-07');
+alter table t1 modify id int auto_increment key;
+delete from t1 for portion of app from '2023-07-20' to '2024-05-23';
+select * from t1;
+id	s	e
+2	2024-05-23	2024-06-07
+drop table t1;
+create table t1 (id int, s date, e date, period for app(s,e))
+partition by key(id);
+insert into t1 (s,e) values ('2023-07-21','2024-06-07');
+alter table t1 modify id int auto_increment key;
+delete from t1 for portion of app from '2023-07-20' to '2024-05-23';
+select * from t1;
+id	s	e
+2	2024-05-23	2024-06-07
+drop table t1;
+drop table log_tbl;
+drop procedure log;

mysql-test/suite/period/t/delete.test

@@ -1,5 +1,6 @@
 source suite/period/engines.inc;
 source include/have_log_bin.inc;
+source include/have_partition.inc;
 
 create table t (id int, s date, e date, period for apptime(s,e));
 
@@ -225,3 +226,31 @@ delete ignore from t
 --enable_warnings
 
 drop table t;
+
+--echo #
+--echo # MDEV-19190 Assertion `part_share->auto_inc_initialized` failed in
+--echo # ha_partition::get_auto_increment
+--echo #
+create table t1 (id int, s date, e date, period for app(s,e))
+                partition by key(id);
+insert into t1 (s,e) values ('2023-07-21','2024-06-07');
+alter table t1 modify id int auto_increment key;
+delete from t1 for portion of app from '2023-07-20' to '2024-05-23';
+select * from t1;
+drop table t1;
+
+create table t1 (id int, s date, e date, period for app(s,e))
+                partition by key(id);
+insert into t1 (s,e) values ('2023-07-21','2024-06-07');
+alter table t1 modify id int auto_increment key;
+--let $trig_table=t1
+--let $trig_cols=id, s, e
+--disable_query_log
+--source suite/period/create_triggers.inc
+--enable_query_log
+
+delete from t1 for portion of app from '2023-07-20' to '2024-05-23';
+select * from t1;
+drop table t1;
+drop table log_tbl;
+drop procedure log;

sql/handler.cc

@@ -4003,7 +4003,7 @@ void handler::print_error(int error, myf errflag)
     break;
   case HA_ERR_AUTOINC_ERANGE:
     textno= error;
-    my_error(textno, errflag, table->next_number_field->field_name.str,
+    my_error(textno, errflag, table->found_next_number_field->field_name.str,
              table->in_use->get_stmt_da()->current_row_for_warning());
     DBUG_VOID_RETURN;
     break;

sql/sql_delete.cc

@@ -707,6 +707,10 @@ bool mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds,
   {
     table->use_all_columns();
     table->rpl_write_set= table->write_set;
+    // Initialize autoinc.
+    // We don't set next_number_field here, as it is handled manually.
+    if (table->found_next_number_field)
+      table->file->info(HA_STATUS_AUTO);
   }
   else
   {

sql/table.cc

@@ -8733,6 +8733,7 @@ int TABLE::update_generated_fields()
     res= found_next_number_field->set_default();
     if (likely(!res))
       res= file->update_auto_increment();
+    next_number_field= NULL;
   }
 
   if (likely(!res) && vfield)