Feng Lu created HIVE-3421:
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Summary: Column Level Top K Values Statistics
Key: HIVE-3421
URL: https://issues.apache.org/jira/browse/HIVE-3421
Project: Hive
Issue Type: New Feature
Reporter: Feng Lu
Assignee: Feng Lu
Compute (estimate) top k values for each column, and put the most skewed column
into skewed info, if user hasn't specified skew.
This feature depends on ListBucketing (create skewed table)
https://cwiki.apache.org/Hive/listbucketing.html.
All column topk can be added to skewed info, if in the future skewed info
supports multiple independent columns.
The TopK algorithm is based on this paper:
http://www.cs.ucsb.edu/research/tech_reports/reports/2005-23.pdf
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