hsyuan commented on a change in pull request #1966:
URL: https://github.com/apache/calcite/pull/1966#discussion_r422723687
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File path:
core/src/main/java/org/apache/calcite/plan/volcano/VolcanoPlanner.java
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@@ -717,9 +718,10 @@ public RelOptCost getCost(RelNode rel, RelMetadataQuery
mq) {
public RelSubset getSubset(RelNode rel) {
assert rel != null : "pre: rel != null";
if (rel instanceof RelSubset) {
- return (RelSubset) rel;
+ return canonize((RelSubset) rel);
} else {
- return mapRel2Subset.get(rel);
+ RelSubset s = mapRel2Subset.get(rel);
+ return s == null ? null : canonize(s);
Review comment:
If the stale subset is required state, during canonize, we may get a
subset with delivered. This will lose another info.
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