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Dudu Markovitz commented on HIVE-5483: -------------------------------------- Hi guys, perhaps I'm missing something but do I have any guarantee for the correctness of the metadata when someone can simply delete or replace a files directly in the file system without going through the metastore? > use metastore statistics to optimize max/min/etc. queries > --------------------------------------------------------- > > Key: HIVE-5483 > URL: https://issues.apache.org/jira/browse/HIVE-5483 > Project: Hive > Issue Type: Improvement > Reporter: Sergey Shelukhin > Assignee: Ashutosh Chauhan > Fix For: 0.13.0 > > Attachments: HIVE-5483.2.patch, HIVE-5483.3.patch, HIVE-5483.patch > > > We have discussed this a little bit. > Hive can answer queries such as select max(c1) from t purely from metastore > using partition statistics, provided that we know the statistics are up to > date. > All data changes (e.g. adding new partitions) currently go thru metastore so > we can track up-to-date-ness. If they are not up-to-date, the queries will > have to read data (at least for outdated partitions) until someone runs > analyze table. We can also analyze new partitions after add, if that is > configured/specified in the command. -- This message was sent by Atlassian JIRA (v6.3.4#6332)