Expressions passed to this function must have the following data types:
| Expression | Data Types Allowed |
|---|---|
| string1 | CHAR, VARCHAR, CLOB |
| string2 | CHAR, VARCHAR, CLOB |
| ci | INTEGER |
| cd | INTEGER |
| cs | INTEGER |
| ct | INTEGER |
You can also pass arguments with data types that can be converted to the preceding types using the implicit data type conversion rules that apply to UDFs.
The UDF implicit type conversion rules are more restrictive than the implicit type conversion rules typically used by Vantage. An argument that cannot be converted to the required data type following the UDF implicit conversion rule must be explicitly cast.