akshat0395 commented on code in PR #3997:
URL: https://github.com/apache/hive/pull/3997#discussion_r1092866326
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standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/columnstats/merge/DateColumnStatsMerger.java:
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@@ -43,64 +46,57 @@ public void merge(ColumnStatisticsObj aggregateColStats,
ColumnStatisticsObj new
DateColumnStatsDataInspector aggregateData =
dateInspectorFromStats(aggregateColStats);
DateColumnStatsDataInspector newData = dateInspectorFromStats(newColStats);
- setLowValue(aggregateData, newData);
- setHighValue(aggregateData, newData);
-
- aggregateData.setNumNulls(aggregateData.getNumNulls() +
newData.getNumNulls());
- if (aggregateData.getNdvEstimator() == null || newData.getNdvEstimator()
== null) {
- aggregateData.setNumDVs(Math.max(aggregateData.getNumDVs(),
newData.getNumDVs()));
- } else {
- NumDistinctValueEstimator oldEst = aggregateData.getNdvEstimator();
- NumDistinctValueEstimator newEst = newData.getNdvEstimator();
- final long ndv;
- if (oldEst.canMerge(newEst)) {
- oldEst.mergeEstimators(newEst);
- ndv = oldEst.estimateNumDistinctValues();
- aggregateData.setNdvEstimator(oldEst);
- } else {
- ndv = Math.max(aggregateData.getNumDVs(), newData.getNumDVs());
- }
- LOG.debug("Use bitvector to merge column {}'s ndvs of {} and {} to be
{}", aggregateColStats.getColName(),
- aggregateData.getNumDVs(), newData.getNumDVs(), ndv);
- aggregateData.setNumDVs(ndv);
+ Date lowValue = mergeLowValue(getLowValue(aggregateData),
getLowValue(newData));
+ if (lowValue != null) {
+ aggregateData.setLowValue(lowValue);
+ }
+ Date highValue = mergeHighValue(getHighValue(aggregateData),
getHighValue(newData));
+ if (highValue != null) {
Review Comment:
Thanks @asolimando for the explanation, if there is a plan improve the class
hierarchy then it make sense to tackle this then as well.
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