Feng Lu created HIVE-3421: ----------------------------- 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 -- 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