Tianyi Wang has uploaded this change for review. ( http://gerrit.cloudera.org:8080/9949
Change subject: IMPALA-6822: Add a query option to control shuffling by distinct exprs ...................................................................... IMPALA-6822: Add a query option to control shuffling by distinct exprs IMPALA-4794 changed the distinct aggregation behavior to shuffling by both grouping exprs and the distinct expr. It's slower in queries where the NDVs of grouping exprs are high and data are uniformly distributed among groups. This patch adds a query option controlling this behavior, letting users switch to the old plan. Change-Id: Icb4b4576fb29edd62cf4b4ba0719c0e0a2a5a8dc --- M be/src/service/query-options.cc M be/src/service/query-options.h M common/thrift/ImpalaInternalService.thrift M common/thrift/ImpalaService.thrift M fe/src/main/java/org/apache/impala/planner/DistributedPlanner.java M fe/src/test/java/org/apache/impala/planner/PlannerTest.java A testdata/workloads/functional-planner/queries/PlannerTest/no-shuffle-on-distinct.test 7 files changed, 856 insertions(+), 16 deletions(-) git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/49/9949/1 -- To view, visit http://gerrit.cloudera.org:8080/9949 To unsubscribe, visit http://gerrit.cloudera.org:8080/settings Gerrit-Project: Impala-ASF Gerrit-Branch: master Gerrit-MessageType: newchange Gerrit-Change-Id: Icb4b4576fb29edd62cf4b4ba0719c0e0a2a5a8dc Gerrit-Change-Number: 9949 Gerrit-PatchSet: 1 Gerrit-Owner: Tianyi Wang <tw...@cloudera.com>
