Indhumathi27 commented on code in PR #6202:
URL: https://github.com/apache/hive/pull/6202#discussion_r2665854600
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ql/src/java/org/apache/hadoop/hive/ql/optimizer/LimitPushdownOptimizer.java:
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@@ -198,6 +198,11 @@ public Object process(Node nd, Stack<Node> stack,
}
currentOp = currentOp.getChildOperators().get(0);
}
+ // Skip RS copy for plans that are already TopNKey-optimized to avoid
re-propagating
+ // TopNKey configuration into the same ReduceSink.
+ if (((LimitPushdownContext)procCtx).disallowRSCopy &&
foundGroupByOperator) {
Review Comment:
This check is added to avoid propagating RS in case of RS-GB-RS, where RS1
is already TopNkey optimized.
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