MDEV-22424 Server crashes in handler::check_duplicate_long_entry_key or Assertion `inited == NONE || lookup_handler != this' failed upon DELETE FOR PORTION on table with long unique key

even if we're *allowed to* convert DELETE .. FOR PERIOD OF
into an update internally, doesn't think we'll *be able to*.

We always have to prepare for insert.

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

@@ -368,3 +368,7 @@ drop procedure sp;
 drop table t,t2,t3,log_tbl;
 drop view v;
 drop procedure log;
+create table t1 (pk int, s date, e date,  period for se (s,e), primary key (pk,se without overlaps));
+insert into t1 values (1,'2020-01-01','2020-02-20');
+delete from t1 for portion of se from '2020-01-30' to '2020-01-31';
+drop table t1;

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

@@ -198,3 +198,11 @@ drop procedure sp;
 drop table t,t2,t3,log_tbl;
 drop view v;
 drop procedure log;
+
+#
+# MDEV-22424 Server crashes in handler::check_duplicate_long_entry_key or Assertion `inited == NONE || lookup_handler != this' failed upon DELETE FOR PORTION on table with long unique key
+#
+create table t1 (pk int, s date, e date,  period for se (s,e), primary key (pk,se without overlaps));
+insert into t1 values (1,'2020-01-01','2020-02-20');
+delete from t1 for portion of se from '2020-01-30' to '2020-01-31';
+drop table t1;

sql/sql_delete.cc

@@ -753,8 +753,7 @@ bool mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds,
           && !table->versioned()
           && table->file->has_transactions();
 
-  if (table->versioned(VERS_TIMESTAMP) ||
-      (table_list->has_period() && !portion_of_time_through_update))
+  if (table->versioned(VERS_TIMESTAMP) || (table_list->has_period()))
     table->file->prepare_for_insert(1);
   DBUG_ASSERT(table->file->inited != handler::NONE);