WeichenXu123 commented on code in PR #42431:
URL: https://github.com/apache/spark/pull/42431#discussion_r1290829879


##########
mllib/src/main/scala/org/apache/spark/mllib/stat/correlation/SpearmanCorrelation.scala:
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@@ -65,8 +65,8 @@ private[stat] object SpearmanCorrelation extends Correlation 
with Logging {
         output
       }
       iter.flatMap { case (((j, v), uid), rank) =>
-        // If we see a new value or cachedUids is too big, we flush ids with 
their average rank.
-        if (j != preCol || v != preVal || cachedUids.size >= 10000000) {

Review Comment:
   What happens if we don't flush it when `cachedUids.size >= 10000000` ? OOM 
occurs ? 



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