sql/item.cc: WL#3527 : inspected a covarage report
@ -3907,7 +3907,9 @@ bool Item_field::fix_fields(THD *thd, Item **reference)
{
/* First usage of column */
table->used_fields++; // Used to optimize loops
/* purecov: begin inspected */
table->covering_keys.intersect(field->part_of_key);
/* purecov: end */
}