SourabhBadhya commented on code in PR #3812:
URL: https://github.com/apache/hive/pull/3812#discussion_r1039378601
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ql/src/java/org/apache/hadoop/hive/ql/txn/compactor/StatsUpdater.java:
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@@ -73,6 +69,9 @@ public void gatherStats(CompactionInfo ci, HiveConf conf,
String userName, Strin
sb.append(")");
}
sb.append(" compute statistics");
+ if (ci.isMinorCompaction()) {
+ sb.append(" noscan");
Review Comment:
Minor compaction is expected to not compact too many files and hence in most
scenarios only the number of files gets changed after minor compaction. Whereas
large updates like major compaction needs to update all statistics (since it
happens once in a while) to keep the metadata updated. Therefore the idea was
to do a fast update of statistics on a minor compaction & do complete update in
case of major compaction.
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