Qifan Chen has posted comments on this change. ( http://gerrit.cloudera.org:8080/16723 )
Change subject: IMPALA-10314: Optimize planning time for simple limits ...................................................................... Patch Set 4: (1 comment) http://gerrit.cloudera.org:8080/#/c/16723/4/testdata/workloads/functional-planner/queries/PlannerTest/optimize-simple-limit.test File testdata/workloads/functional-planner/queries/PlannerTest/optimize-simple-limit.test: http://gerrit.cloudera.org:8080/#/c/16723/4/testdata/workloads/functional-planner/queries/PlannerTest/optimize-simple-limit.test@241 PS4, Line 241: limit 1 > In HdfsScanNode.computeScanRangeLocation(), we skip computing the scan rang Yeah, that is a tricky issue. If we take the optimistic approach, we could add a new step in (2) when empty files are found. That is, in this new step we come up with extra up to <n> non-empty files for a total of <n> empty files found in the pruned list. Another approach would be abandon the pruned list and go with the full list. -- To view, visit http://gerrit.cloudera.org:8080/16723 To unsubscribe, visit http://gerrit.cloudera.org:8080/settings Gerrit-Project: Impala-ASF Gerrit-Branch: master Gerrit-MessageType: comment Gerrit-Change-Id: I9d6a79263bc092e0f3e9a1d72da5618f3cc35574 Gerrit-Change-Number: 16723 Gerrit-PatchSet: 4 Gerrit-Owner: Aman Sinha <amsi...@cloudera.com> Gerrit-Reviewer: Aman Sinha <amsi...@cloudera.com> Gerrit-Reviewer: Impala Public Jenkins <impala-public-jenk...@cloudera.com> Gerrit-Reviewer: Qifan Chen <qc...@cloudera.com> Gerrit-Reviewer: Shant Hovsepian <sh...@cloudera.com> Gerrit-Reviewer: Tim Armstrong <tarmstr...@cloudera.com> Gerrit-Comment-Date: Thu, 19 Nov 2020 01:42:42 +0000 Gerrit-HasComments: Yes
