guozhangwang commented on code in PR #12555:
URL: https://github.com/apache/kafka/pull/12555#discussion_r960983275
##########
streams/src/main/java/org/apache/kafka/streams/kstream/internals/InternalStreamsBuilder.java:
##########
@@ -270,16 +272,20 @@ private void maybeAddNodeForOptimizationMetadata(final
GraphNode node) {
// use this method for testing only
public void buildAndOptimizeTopology() {
- buildAndOptimizeTopology(false);
+ buildAndOptimizeTopology(false, false);
}
- public void buildAndOptimizeTopology(final boolean optimizeTopology) {
+ public void buildAndOptimizeTopology(
+ final boolean optimizeTopology, final boolean optimizeSelfJoin) {
mergeDuplicateSourceNodes();
if (optimizeTopology) {
LOG.debug("Optimizing the Kafka Streams graph for repartition
nodes");
optimizeKTableSourceTopics();
maybeOptimizeRepartitionOperations();
+ if (optimizeSelfJoin) {
Review Comment:
Hmm.. for case 2), the logical plan would be like:
```
root -> source1
root -> source2
source1 -> join-window1
source2 -> join-window2
source1,source2 -> stream-join
```
Is that right?
For case 3), since we are not re-assigning the result of `mapValues` to
stream` it should just be a no-op right? The logical plan would be like:
```
root -> source1
root -> source2
source1 -> join-window1
source1 -> map-values1
source2 -> join-window2
source1,source2 -> stream-join
```
Should that be considered optimizable as well?
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