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Feng Lu updated HIVE-3421: -------------------------- Attachment: HIVE-3421.patch.1.txt > 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 > Attachments: HIVE-3421.patch.1.txt, HIVE-3421.patch.txt > > > 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 table skewed on) > 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 -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira