Github user twalthr commented on the issue:
    @vasia You are right. The `TypeExtractor` doesn't support functions with 
more than 2 inputs. That has never been required so far as the runtime 
operators always have two inputs. You could open an issue for that if this 
feature makes sense.
    `TypeExtractor.getMapReturnTypes` has support for Java 8 lambdas and checks 
for the `ResultTypeQueryable` interface first, so I would use the more specific 
`getXXXReturnTypes` (the plural has historic reasons) method if possible and 
the generic `createTypeInfo` method otherwise. Just make sure that you don't 
set the `allowMissing` flag otherwise you might get a `MissingTypeInfo` back.

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