What MySQL returns if we provide an empty string for padding with other string in LPAD() or RPAD() functions?

Suppose if we provide an empty string for padding on LPAD() or RPAD() functions then MySQL will return NULL as output. Following example will demonstrate it −

Example

mysql> Select LPAD('ABCD',22,'');

+--------------------+
| LPAD('ABCD',22,'') |
+--------------------+
| NULL               |
+--------------------+

1 row in set (0.00 sec)

mysql> Select RPAD('ABCD',22,'');

+--------------------+
| RPAD('ABCD',22,'') |
+--------------------+
| NULL               |
+--------------------+

1 row in set (0.00 sec)