Github user gaborhermann commented on a diff in the pull request:
https://github.com/apache/flink/pull/771#discussion_r31719989
--- Diff:
flink-staging/flink-streaming/flink-streaming-core/src/main/java/org/apache/flink/streaming/api/datastream/DataStream.java
---
@@ -617,7 +617,7 @@ protected ExecutionConfig getExecutionConfig() {
*/
public <R> SingleOutputStreamOperator<R, ?> fold(R initialValue,
FoldFunction<OUT, R> folder) {
TypeInformation<R> outType =
TypeExtractor.getFoldReturnTypes(clean(folder), getType(),
- Utils.getCallLocationName(), false);
+ Utils.getCallLocationName(), true);
--- End diff --
I set allowMissing to true as it was set at flatMap. Leaving it on false
caused the call fold in the Scala DataStream fail.
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