MDEV-18747 InnoDB: Failing assertion: table->get_ref_count() == 0 upon...

MDEV-18747 InnoDB: Failing assertion: table->get_ref_count() == 0 upon dropping temporary table with unique blob

delete update handler clone also for temporary tables

mysql-test/main/long_unique_bugs.result

@@ -49,3 +49,7 @@ pk	f	row_end > DATE'2030-01-01'
 1	foo	0
 1	bar	0
 drop table t1;
+create temporary table t1 (f blob, unique(f)) engine=innodb;
+insert into t1 values (1);
+replace into t1 values (1);
+drop table t1;

mysql-test/main/long_unique_bugs.test

@@ -56,3 +56,11 @@ update t1 set f = 'foo';
 select * from t1;
 select pk, f, row_end > DATE'2030-01-01' from t1 for system_time all;
 drop table t1;
+
+#
+# MDEV-18747 InnoDB: Failing assertion: table->get_ref_count() == 0 upon dropping temporary table with unique blob
+#
+create temporary table t1 (f blob, unique(f)) engine=innodb;
+insert into t1 values (1);
+replace into t1 values (1);
+drop table t1;

sql/temporary_tables.cc

@@ -731,6 +731,8 @@ void THD::mark_tmp_tables_as_free_for_reuse()
     {
       if ((table->query_id == query_id) && !table->open_by_handler)
       {
+        if (table->update_handler)
+          table->delete_update_handler();
         mark_tmp_table_as_free_for_reuse(table);
       }
     }