ygerzhedovich commented on code in PR #1743:
URL: https://github.com/apache/ignite-3/pull/1743#discussion_r1124255892
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modules/sql-engine/src/main/java/org/apache/ignite/internal/sql/engine/prepare/PlannerHelper.java:
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@@ -108,4 +136,49 @@ public static IgniteRel optimize(SqlNode sqlNode,
IgnitePlanner planner) {
throw ex;
}
}
+
+ /**
+ * A shuttle to estimate a biggest join to optimize.
+ *
+ * <p>There are only two rules: <ol>
+ * <li>Each achievable leaf node contribute to join complexity, thus
must be counted</li>
+ * <li>If this shuttle reach the {@link LogicalCorrelate} node, only
left shoulder will be
+ * analysed by this shuttle. For right shoulder a new shuttle will
be created, and maximum
+ * of previously found subquery and current one will be saved</li>
+ * </ol>
+ */
+ public static class JoinSizeFinder extends RelHomogeneousShuttle {
Review Comment:
Can it be a private class?
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