Vineet Garg created HIVE-17308: ---------------------------------- Summary: Improvement in join cardinality estimation Key: HIVE-17308 URL: https://issues.apache.org/jira/browse/HIVE-17308 Project: Hive Issue Type: Improvement Components: Query Planning Reporter: Vineet Garg Assignee: Vineet Garg
Currently during logical planning join cardinality is estimated assuming no correlation among join keys (This estimation is done using exponential backoff). Physical planning on the other hand consider correlation for multi keys and uses different estimation. We should consider correlation during logical planning as well. -- This message was sent by Atlassian JIRA (v6.4.14#64029)