helifu has posted comments on this change. ( http://gerrit.cloudera.org:8080/11722 )
Change subject: KUDU-2038: Support bitmap index ...................................................................... Patch Set 6: (3 comments) http://gerrit.cloudera.org:8080/#/c/11722/1//COMMIT_MSG Commit Message: http://gerrit.cloudera.org:8080/#/c/11722/1//COMMIT_MSG@7 PS1, Line 7: KUDU-2038: Support bitmap index > have you read the recent paper on Column Sketches? https://stratos.seas.har thanks for your sharing:) http://gerrit.cloudera.org:8080/#/c/11722/1//COMMIT_MSG@14 PS1, Line 14: data. Notice that there is no bitmap info on memory rowset. And, : the bitmap info is generat > > The rows in a DRS is limited, so the memory for the bitmaps is limited to Yes, you are thoughtful. http://gerrit.cloudera.org:8080/#/c/11722/1//COMMIT_MSG@23 PS1, Line 23: > There were a few other predicate evaluation perf bug fixes in the last 6-12 Yes, i noticed that jira before and i am sure it is the big improvement i talked about.Thanks to Dan's work. At branch-1.4.x, the bitmap index can speed up n*10x, but at recent master branch it is only 10x. And i think Kudu's speed is fast enough right now. All right, thanks for your comments and i am going to read the paper you mentioned earlier. -- To view, visit http://gerrit.cloudera.org:8080/11722 To unsubscribe, visit http://gerrit.cloudera.org:8080/settings Gerrit-Project: kudu Gerrit-Branch: master Gerrit-MessageType: comment Gerrit-Change-Id: I0edaa0ef1dba2dbce85ebf15f0a731e4939a7860 Gerrit-Change-Number: 11722 Gerrit-PatchSet: 6 Gerrit-Owner: helifu <[email protected]> Gerrit-Reviewer: Andrew Wong <[email protected]> Gerrit-Reviewer: Kudu Jenkins (120) Gerrit-Reviewer: Tidy Bot (241) Gerrit-Reviewer: Todd Lipcon <[email protected]> Gerrit-Reviewer: helifu <[email protected]> Gerrit-Comment-Date: Wed, 14 Nov 2018 01:49:54 +0000 Gerrit-HasComments: Yes
