deniskuzZ commented on code in PR #6202:
URL: https://github.com/apache/hive/pull/6202#discussion_r2595404436
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ql/src/java/org/apache/hadoop/hive/ql/optimizer/topnkey/TopNKeyProcessor.java:
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@@ -71,6 +71,13 @@ public Object process(Node nd, Stack<Node> stack,
NodeProcessorCtx procCtx,
return null;
}
+ // Skip the current optimization when a simple global ORDER BY...LIMIT is
present
+ // (topN > -1 and hasOnlyOrderByLimit()).
+ // This plan structure is handled more efficiently by the specialized
'TopN In Reducer' optimization.
+ if (reduceSinkDesc.getTopN() > -1 && reduceSinkDesc.hasOnlyOrderByLimit())
{
Review Comment:
cc @zabetak, @kasakrisz
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