Github user twalthr commented on a diff in the pull request:
https://github.com/apache/flink/pull/4039#discussion_r120860095
--- Diff:
flink-streaming-java/src/main/java/org/apache/flink/streaming/api/datastream/AllWindowedStream.java
---
@@ -507,12 +505,41 @@ public AllWindowedStream(DataStream<T> input,
TypeInformation<V> aggResultType =
TypeExtractor.getAggregateFunctionReturnType(
aggFunction, input.getType(), null, false);
- TypeInformation<R> resultType =
TypeExtractor.getUnaryOperatorReturnType(
- windowFunction, AllWindowFunction.class, true,
true, aggResultType, null, false);
+ TypeInformation<R> resultType =
getAllWindowFunctionReturnType(windowFunction, aggResultType);
return aggregate(aggFunction, windowFunction, accumulatorType,
aggResultType, resultType);
}
+ private static <IN, OUT> TypeInformation<OUT>
getAllWindowFunctionReturnType(
+ AllWindowFunction<IN, OUT, ?> function,
+ TypeInformation<IN> inType) {
+ return TypeExtractor.getUnaryOperatorReturnType(
+ function,
+ AllWindowFunction.class,
+ 0,
+ 1,
+ new int[]{1, 0},
+ new int[]{2, 0},
+ inType,
+ null,
+ false);
+ }
+
+ private static <IN, OUT> TypeInformation<OUT>
getProcessAllWindowFunctionReturnType(
+ ProcessAllWindowFunction<IN, OUT, ?> function,
+ TypeInformation<IN> inType) {
+ return TypeExtractor.getUnaryOperatorReturnType(
+ function,
+ ProcessAllWindowFunction.class,
+ 0,
+ 1,
+ new int[]{1, 0},
--- End diff --
@dawidwys correct me if I'm wrong but as far as I know, a
`FunctionalInterface` must be an interface. All `ProcessXXX` functions are
regular classes with one abstract methods, but this does not qualify them for
lambdas. See also
https://stackoverflow.com/questions/24610207/abstract-class-as-functional-interface
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