kgyrtkirk commented on code in PR #5337:
URL: https://github.com/apache/hive/pull/5337#discussion_r1689469059


##########
ql/src/java/org/apache/hadoop/hive/ql/optimizer/stats/annotation/StatsRulesProcFactory.java:
##########
@@ -557,14 +557,17 @@ private long evaluateInExpr(Statistics stats, 
ExprNodeDesc pred, long currNumRow
       }
       for (int i = 0; i < columnStats.size(); i++) {
         long dvs = columnStats.get(i) == null ? 0 : 
columnStats.get(i).getCountDistint();
-        long intersectionSize = estimateIntersectionSize(aspCtx.getConf(), 
columnStats.get(i), values.get(i));
+        if (dvs == 0) {
+          factor *= 0.5;

Review Comment:
   sure you could use that as well - that's also better than burning in`.5`



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