deniskuzZ commented on code in PR #5674:
URL: https://github.com/apache/hive/pull/5674#discussion_r2023085228
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standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/columnstats/aggr/LongColumnStatsAggregator.java:
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@@ -192,7 +207,13 @@ public ColumnStatisticsObj
aggregate(List<ColStatsObjWithSourceInfo> colStatsWit
csd.setLongStats(aggregateData);
adjustedStatsMap.put(pseudoPartName.toString(), csd);
if (useDensityFunctionForNDVEstimation) {
- densityAvgSum += ((double) (aggregateData.getHighValue() -
aggregateData.getLowValue())) / aggregateData.getNumDVs();
+ if (aggregateData.getNumDVs() == 0) {
+ // If NDV is not present, assume that the density is 0.5.
+ densityAvgSum += 0.5;
+ } else {
+ double range = aggregateData.getHighValue() -
aggregateData.getLowValue();
Review Comment:
no need for `range` var
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