[ https://issues.apache.org/jira/browse/PHOENIX-5793?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
chenglei updated PHOENIX-5793: ------------------------------ Attachment: PHOENIX-5793_v1-4.x.patch > Support parallel init and fast null return for SortMergeJoinPlan. > ----------------------------------------------------------------- > > Key: PHOENIX-5793 > URL: https://issues.apache.org/jira/browse/PHOENIX-5793 > Project: Phoenix > Issue Type: Improvement > Affects Versions: 5.0.0 > Reporter: Chen Feng > Assignee: Chen Feng > Priority: Minor > Fix For: 5.1.0 > > Attachments: PHOENIX-5793-v2.patch, PHOENIX-5793-v3.patch, > PHOENIX-5793-v4.patch, PHOENIX-5793-v5.patch, PHOENIX-5793_v1-4.x.patch > > > For a join sql like A join B. The implementation of SortMergeJoinPlan > currently inits the two iterators A and B one by one. > By initializing A and B in parallel, we can improve performance in two > aspects. > 1) By overlapping the time in initializing. > 2) If one child query is null, the other child query can be canceled since > the final result must be null. > -- This message was sent by Atlassian Jira (v8.3.4#803005)