What is the output of the MySQL ELT() function if the index number supplied as a parameter is not an integer?

As we know, the first parameter of the ELT() function must be an integer value, but when the index number we provide is not an integer, MySQL's ELT() function will Return NULL and display a warning.

Example

mysql> select ELT('one','Ram,is,good,boy')As Result;
+--------+
| Result |
+--------+
| NULL   |
+--------+
1 row in set, 1 warning (0.00 sec)

mysql> Show Warnings;
+---------+------+------------------------------------------+
| Level   | Code | Message                                  |
+---------+------+------------------------------------------+
| Warning | 1292 | Truncated incorrect INTEGER value: 'one' |
+---------+------+------------------------------------------+
1 row in set (0.00 sec)

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