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[CALCITE-5992] Avoid comparing root Relsubset's TraitSet with itself #3415

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[CALCITE-5992] Avoid comparing root Relsubset's TraitSet with itself #3415

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3 changes: 3 additions & 0 deletions core/src/main/java/org/apache/calcite/plan/volcano/VolcanoPlanner.java
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Original file line number Diff line number Diff line change
Expand Up @@ -565,6 +565,9 @@ void ensureRootConverters() {
}
}
for (RelSubset subset : root.set.subsets) {
if (subset == root) {
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I'm not sure whether the logic of these lines of code is correct, could you add a unit test for this logic?

continue;
}
final ImmutableList<RelTrait> difference =
root.getTraitSet().difference(subset.getTraitSet());
if (difference.size() == 1 && subsets.add(subset)) {
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