[ https://issues.apache.org/jira/browse/HIVE-20393?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Deepak Jaiswal updated HIVE-20393: ---------------------------------- Attachment: HIVE-20393.2.patch > Semijoin Reduction : markSemiJoinForDPP behaves inconsistently > -------------------------------------------------------------- > > Key: HIVE-20393 > URL: https://issues.apache.org/jira/browse/HIVE-20393 > Project: Hive > Issue Type: Bug > Reporter: Deepak Jaiswal > Assignee: Deepak Jaiswal > Priority: Major > Attachments: HIVE-20393.1.patch, HIVE-20393.2.patch > > > markSemiJoinForDPP has multiple issues, > > * Uses map tsOps which is wrong as it disallows going thru same TS which may > have filters from more than 1 semijoin edges. This results in inconsistent > plans for same query as semijoin edges may be processed in different order > each time. > * Uses getColumnExpr() which is not as robust as extractColumn() thus > resulting in NPEs. > * The logic to mark an edge useful when NPE is hit may end up having bad > edge. > cc [~gopalv] -- This message was sent by Atlassian JIRA (v7.6.3#76005)