Github user zentol commented on a diff in the pull request:
https://github.com/apache/flink/pull/3501#discussion_r105239687
--- Diff:
flink-streaming-java/src/main/java/org/apache/flink/streaming/api/datastream/KeyedStream.java
---
@@ -114,9 +121,53 @@ public KeyedStream(DataStream<T> dataStream,
KeySelector<T, KEY> keySelector, Ty
dataStream.getTransformation(),
new KeyGroupStreamPartitioner<>(keySelector,
StreamGraphGenerator.DEFAULT_LOWER_BOUND_MAX_PARALLELISM)));
this.keySelector = keySelector;
- this.keyType = keyType;
+ this.keyType = validateKeyType(keyType);
}
-
+
+ private TypeInformation<KEY> validateKeyType(TypeInformation<KEY>
keyType) {
+ Stack<TypeInformation<?>> stack = new Stack<>();
+ stack.push(keyType);
+
+ while (!stack.isEmpty()) {
+ TypeInformation<?> typeInfo = stack.pop();
+
+ if (!validateKeyTypeIsHashable(typeInfo)) {
+ throw new InvalidProgramException("This type ("
+ keyType + ") cannot be used as key.");
--- End diff --
Let's include ```typeInfo``` in this exception as well to narrow it down
for the user. We may even want to delay the exception until we scanned the
entire type and report all invalid keys at once.
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