Github user kl0u commented on a diff in the pull request:
https://github.com/apache/flink/pull/3484#discussion_r105398836
--- Diff:
flink-streaming-java/src/main/java/org/apache/flink/streaming/api/graph/StreamGraphGenerator.java
---
@@ -300,6 +303,36 @@ private StreamGraph
generateInternal(List<StreamTransformation<?>> transformatio
}
/**
+ * Transforms a {@code SideOutputTransformation}.
+ *
+ * <p>
+ * For this we create a virtual node in the {@code StreamGraph} that
holds the side-output
+ * {@link org.apache.flink.util.OutputTag}.
+ *
+ * @see org.apache.flink.streaming.api.graph.StreamGraphGenerator
+ */
+ private <T> Collection<Integer>
transformSideOutput(SideOutputTransformation<T> sideOutput) {
+ StreamTransformation<T> input = sideOutput.getInput();
+ Collection<Integer> resultIds = transform(input);
+
+
+ // the recursive transform might have already transformed this
+ if (alreadyTransformed.containsKey(sideOutput)) {
+ return alreadyTransformed.get(sideOutput);
+ }
+
+ List<Integer> virtualResultIds = new ArrayList<>();
+
+ for (int inputId : resultIds) {
+ int virtualId = StreamTransformation.getNewNodeId();
+ streamGraph.addVirtualSideOutputNode(inputId,
virtualId, sideOutput.getOutputTag());
+ virtualResultIds.add(virtualId);
+ }
+ return virtualResultIds;
+ }
+
+
--- End diff --
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