[jira] [Created] (HIVE-3959) Update Partition Statistics in Metastore Layer

["Bhushan Mandhani (JIRA)" <ji...@apache.org>]

Bhushan Mandhani created HIVE-3959:
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             Summary: Update Partition Statistics in Metastore Layer
                 Key: HIVE-3959
                 URL: https://issues.apache.org/jira/browse/HIVE-3959
             Project: Hive
          Issue Type: Improvement
          Components: Metastore, Statistics
            Reporter: Bhushan Mandhani
            Assignee: Bhushan Mandhani
            Priority: Minor


When partitions are created using queries ("insert overwrite" and "insert into") then the StatsTask updates all stats. However, when partitions are added directly through metadata-only partitions (either CLI or direct calls to Thrift Metastore) no stats are populated even if hive.stats.reliable is set to true. This puts us in a situation where we can't decide if stats are truly reliable or not.

We propose that the "fast stats" (numFiles and totalSize) which don't require a scan of the data should always be populated and be completely reliable. For now we are still excluding rowCount and rawDataSize because that will make these operations very expensive. Currently they are quick metadata-only ops.  

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