What is the bug?

Some math functions return ±NaN instead of NULL. NaN is not serializable by GSON lib.
For example, LN uses Math.log which returns -NaN for negative values.

How can one reproduce the bug?

opensearchsql> select LN(-12.34567);
{'reason': 'Invalid SQL query', 'details': 'NaN is not a valid double value as per JSON specification. To override this behavior, use GsonBuilder.serializeSpecialFloatingPointValues() method.', 'type': 'IllegalArgumentException'}

What is the expected behavior?

mysql> select LN(-12.34567);
+---------------+
| LN(-12.34567) |
+---------------+
|          NULL |
+---------------+

What is your host/environment?

main @ 9d4a841

Do you have any additional context?

Fix all math functions or patch serializer callee in protocol module to replace all ±NaN by NULLs.