vpapavas commented on code in PR #12555:
URL: https://github.com/apache/kafka/pull/12555#discussion_r961032133
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streams/src/main/java/org/apache/kafka/streams/kstream/internals/InternalStreamsBuilder.java:
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@@ -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:
Discussed offline with @guozhangwang .
If the `map` or other transformation is a sibling of the join node but the
join node has a single parent, then this means this transformation is a no-op
and hence the optimization can be applied. For the transformation to not be a
no-op, the join node must have two or more parents, hence the optimization
won't be applicable.
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