UDSF API methods

The methods described in this section can be used only by UDSFs.

Each UDSF must have a getName(), getType(), getArgs(), evaluate(), and getResult() function.

calculateSize()
When the return type of a UDSF is VARCHAR(ANY), the calculateSize() method is called at runtime to dynamically determine the size of the result column.
evaluate()
The evaluate() method is called once for each row of data in the SQL statement and returns a single value back to the database.
getResult()
The getResult() method is called only during the compilation of a UDSF and indicates the data type that is returned by the evaluate() method.

Parent topic: nzLua API