[GitHub] danny0405 commented on a change in pull request #552: [CALCITE-2018] Queries failed with AssertionError: rel has lower cost…

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danny0405 commented on a change in pull request #552: [CALCITE-2018] Queries failed with AssertionError: rel has lower cost…
URL: https://github.com/apache/calcite/pull/552#discussion_r261851328
 
 

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 File path: core/src/main/java/org/apache/calcite/plan/volcano/RelSet.java
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 @@ -335,6 +340,18 @@ void mergeWith(
     // Has another set merged with this?
     assert equivalentSet == null;
 
+    // calls propagateCostImprovements() for RelSubset instances,
+    // whose best should be changed to checks whether that
+    // subset's parents have gotten cheaper.
+    final Set<RelSubset> activeSet = new HashSet<>();
+    for (Map.Entry<RelSubset, RelNode> subsetBestPair : changedSubsets.entrySet()) {
+      RelSubset relSubset = subsetBestPair.getKey();
+      relSubset.propagateCostImprovements(
+          planner, mq, subsetBestPair.getValue(),
+          activeSet);
 
 Review comment:
   Okey, this is definitely needed.

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