Github user dawidwys commented on a diff in the pull request:

    https://github.com/apache/flink/pull/6120#discussion_r201655466
  
    --- Diff: 
flink-core/src/main/java/org/apache/flink/api/java/typeutils/TypeExtractor.java 
---
    @@ -584,21 +581,6 @@ private static void registerFactory(Type t, Class<? 
extends TypeInfoFactory> fac
                                // number of parameters the SAM of implemented 
interface has; the parameter indexing applies to this range
                                final int baseParametersLen = 
sam.getParameterTypes().length;
     
    -                           // executable references "this" implicitly
    -                           if (paramLen <= 0) {
    --- End diff --
    
    Why you removed checking the input type information?


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