Indhumathi27 commented on code in PR #6202:
URL: https://github.com/apache/hive/pull/6202#discussion_r2665500915
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ql/src/java/org/apache/hadoop/hive/ql/optimizer/topnkey/TopNKeyProcessor.java:
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@@ -111,6 +123,50 @@ public Object process(Node nd, Stack<Node> stack,
NodeProcessorCtx procCtx,
return null;
}
+ /**
+ * Returns true if the ReduceSink is only under an ORDER BY + LIMIT plan
+ * and has no GroupBy or Join operators in its upstream ancestry.
+ * This is used to disable TopNKey for pure ORDER BY LIMIT queries where
+ * LIMIT pushdown must take precedence.
+ */
+ public static boolean isOrderByLimitPath(ReduceSinkOperator rs) {
Review Comment:
it might perform better because of
[HIVE-22666](https://issues.apache.org/jira/browse/HIVE-22666).
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