UDTF API methods

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

processRow()
The processRow() method is called once for each row of data and can return 0 or more rows of data back to the database.
outputRow()
After each call to the processRow() method, if the outputRow() method is defined, it is called until it returns null. This allows a UDTF to output any number of rows efficiently.
getShape()
The getShape() method is called when the UDX is compiled to determine the column names and data types that will be returned by the table function.
calculateShape()
The calculateShape() method allows a UDTF to dynamically determine its output shape (the column names and data types returned by the UDTF). This makes it possible to build versatile functions that can alter their behavior dynaically based on the input values.

Parent topic: nzLua API