Expressions passed to this function must have a data type of VARCHAR(n) CHARACTER SET LATIN, where the maximum supported size (n) is 64000. You can also pass arguments with data types that can be converted to VARCHAR(64000) CHARACTER SET LATIN using the implicit data type conversion rules that apply to UDFs. For example, you can use LZCOMP_L(CHAR), which can be implicitly converted to LZCOMP_L(VARCHAR).
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 VARCHAR following the UDF implicit conversion rules must be explicitly cast.
The input to this function must be Latin character data.
If you specify NULL as input, the function returns NULL.