different fix for MDEV-26778

sql/sql_insert.cc

@@ -4193,7 +4193,6 @@ int select_insert::send_data(List<Item> &values)
   bool error=0;
 
   thd->count_cuted_fields= CHECK_FIELD_WARN;	// Calculate cuted fields
-  table->reset_default_fields();
   store_values(values);
   if (table->default_field &&
       unlikely(table->update_default_fields(info.ignore)))

sql/sql_load.cc

@@ -1106,7 +1106,6 @@ read_sep_field(THD *thd, COPY_INFO &info, TABLE_LIST *table_list,
       }
     }
     restore_record(table, s->default_values);
-    table->reset_default_fields();
 
     while ((item= it++))
     {

sql/sql_update.cc

@@ -51,7 +51,7 @@
    compare_record(TABLE*).
  */
 bool records_are_comparable(const TABLE *table) {
-  return !table->versioned(VERS_TRX_ID) &&
+  return !table->versioned() &&
           (((table->file->ha_table_flags() & HA_PARTIAL_COLUMN_READ) == 0) ||
            bitmap_is_subset(table->write_set, table->read_set));
 }

sql/table.cc

@@ -9164,13 +9164,11 @@ bool TABLE::vers_update_fields()
     {
       DBUG_ASSERT(0);
     }
-    vers_start_field()->set_has_explicit_value();
   }
 
   if (!versioned(VERS_TIMESTAMP) || !vers_end_field()->has_explicit_value())
   {
     vers_end_field()->set_max();
-    vers_end_field()->set_has_explicit_value();
     res= true;
   }
 
@@ -9185,7 +9183,6 @@ void TABLE::vers_update_end()
   if (vers_end_field()->store_timestamp(in_use->query_start(),
                                         in_use->query_start_sec_part()))
     DBUG_ASSERT(0);
-  vers_end_field()->set_has_explicit_value();
 }
 
 /**