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From twalthr <...@git.apache.org>
Subject [GitHub] flink pull request #2337: [FLINK-3042] [FLINK-3060] [types] Define a way to ...
Date Thu, 08 Sep 2016 10:48:52 GMT
Github user twalthr commented on a diff in the pull request:

    --- Diff: flink-core/src/main/java/org/apache/flink/api/java/typeutils/TypeExtractor.java
    @@ -792,12 +832,40 @@ else if (t instanceof Class) {
     		return null;
    +	@SuppressWarnings({"unchecked", "rawtypes"})
     	private <IN1> TypeInformation<?> createTypeInfoFromInput(TypeVariable<?>
returnTypeVar, ArrayList<Type> inputTypeHierarchy, Type inType, TypeInformation<IN1>
inTypeInfo) {
     		TypeInformation<?> info = null;
    +		// use a factory to find corresponding type information to type variable
    +		final ArrayList<Type> factoryHierarchy = new ArrayList<>(inputTypeHierarchy);
    +		final TypeInfoFactory<?> factory = getClosestFactory(factoryHierarchy, inType);
    +		if (factory != null) {
    +			// the type that defines the factory is last in factory hierarchy
    +			final Type factoryDefiningType = factoryHierarchy.get(factoryHierarchy.size() - 1);
    +			// defining type has generics, the factory need to be asked for a mapping of subtypes
to type information
    +			if (factoryDefiningType instanceof ParameterizedType) {
    --- End diff --
    Yes, because we try to create type information from the input in this method. This only
works if a type variable connects input with output. `Map<InType<A>, OutType<A>>`

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