Function switch_to_nullable_trigger_fields

sql/sql_base.cc:9376–9390

Prepare Item_field's for fill_record_n_invoke_before_triggers() This means redirecting from table->field to table->field_to_fill(), if needed. */

  table->field_to_fill(), if needed.
*/
void switch_to_nullable_trigger_fields(List<Item> &items, TABLE *table)
{
  Field** field= table->field_to_fill();

 /* True if we have NOT NULL fields and BEFORE triggers */
  if (field != table->field)
  {
    List_iterator_fast<Item> it(items);
    Item *item;

    while ((item= it++))
      item->walk(&Item::switch_to_nullable_fields_processor,
                 field, WALK_SUBQUERY);
  }
}


/**