}
				}

				onConflict.DoUpdates = append(onConflict.DoUpdates, clause.AssignmentColumns(columns)...)
				if len(onConflict.DoUpdates) == 0 {
					onConflict.DoNothing = true
				}

				// use primary fields as default OnConflict columns
				if len(onConflict.Columns) == 0 {
					for _, field := range stmt.Schema.PrimaryFields {
						onConflict.Columns = append(onConflict.Columns, clause.Column{Name: field.DBName})
					}