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)
```
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at [email protected] or file a JIRA ticket
with INFRA.
---
