xiedeyantu commented on code in PR #4361:
URL: https://github.com/apache/calcite/pull/4361#discussion_r2075274551
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core/src/main/java/org/apache/calcite/rel/rules/IntersectToSemiJoinRule.java:
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@@ -34,9 +34,52 @@
import java.util.List;
/**
- * Planner rule that translates a {@link org.apache.calcite.rel.core.Intersect}
+ * Planner rule that translates a {@link Intersect}
* to a series of {@link org.apache.calcite.rel.core.Join} that type is
- * {@link org.apache.calcite.rel.core.JoinRelType#SEMI}.
+ * {@link JoinRelType#SEMI}. This rule supports n-way Intersect conversion,
+ * as this rule can be repeatedly applied during query optimization to
+ * refine the plan.
+ *
+ * <h2>Example</h2>
+ *
+ <p>Original sql:
Review Comment:
Done!
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