Shreepadma Venugopalan created HIVE-3602:
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Summary: Provide ability to roll up column stats from different
partitions
Key: HIVE-3602
URL: https://issues.apache.org/jira/browse/HIVE-3602
Project: Hive
Issue Type: Bug
Components: Statistics
Affects Versions: 0.10.0
Reporter: Shreepadma Venugopalan
Assignee: Shreepadma Venugopalan
When executing query on a partitioned table it becomes necessary to combine the
statistics from different partitions to know about the combined data
distribution. For eg., consider a table with 5 partitions P0 to P4 and a query
that scans partitions p0, p2 and p4. It becomes necessary to combine the
statistics from the individual partitions to obtain the statistical properties
of the combined data from the partitions. This JIRA covers the task of a)
implementing logic to roll up statistics from specific partitions and b)
providing an API to retrieve the combined statistics
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