Github user rmetzger commented on the pull request:
https://github.com/apache/flink/pull/354#issuecomment-72314532
Without the change, I'm getting the following error, even though my
KeyExtractor implements ResultTypeQueryable:
```java
Exception in thread "main" java.lang.IllegalArgumentException: The types of
the interface org.apache.flink.api.java.functions.KeySelector could not be
inferred. Support for synthetic interfaces, lambdas, and generic types is
limited at this point.
at
org.apache.flink.api.java.typeutils.TypeExtractor.getParameterType(TypeExtractor.java:640)
at
org.apache.flink.api.java.typeutils.TypeExtractor.getParameterTypeFromGenericType(TypeExtractor.java:664)
at
org.apache.flink.api.java.typeutils.TypeExtractor.getParameterType(TypeExtractor.java:627)
at
org.apache.flink.api.java.typeutils.TypeExtractor.validateInputType(TypeExtractor.java:686)
at
org.apache.flink.api.java.typeutils.TypeExtractor.getUnaryOperatorReturnType(TypeExtractor.java:235)
at
org.apache.flink.api.java.typeutils.TypeExtractor.getKeySelectorTypes(TypeExtractor.java:189)
at
org.apache.flink.api.java.typeutils.TypeExtractor.getKeySelectorTypes(TypeExtractor.java:183)
at
org.apache.flink.api.java.operators.JoinOperator$JoinOperatorSets.where(JoinOperator.java:871)
at
flink.generators.programs.TPCHGeneratorExample.main(TPCHGeneratorExample.java:55)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)
```
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