> Will it be referring to orc metadata or it will be loading the whole file and > then counting the rows.
Depends on the partial-scan setting or if it is computing full column stats (the full column stats does an nDV, which reads all rows). hive> analyze table compute statistics ... partialscan; https://issues.apache.org/jira/browse/HIVE-4177 AFAIK, this got removed in Hive 3.x (because we really want autogather column stats on insert, not just basic stats from this). > Is there any place to cache this information so that I don't need to scan all > the files every time. https://cwiki.apache.org/confluence/display/Hive/LLAP Cheers, Gopal
