Thomas Tauber-Marshall has uploaded a new change for review. http://gerrit.cloudera.org:8080/6803
Change subject: IMPALA-5120: Default to partitioned join when stats are missing ...................................................................... IMPALA-5120: Default to partitioned join when stats are missing Previously, we defaulted to broadcast join when stats were missing, but this can lead to disastrous plans when the right hand side is actually large. Its always difficult to make good plans when stats are missing, but defaulting to partitioned joins should reduce the risk of disastrous plans. Testing: - Added a planner test that joins a table with no stats. Change-Id: Ie168ecfcd5e7c5d3c60d16926c151f8f134c81e0 --- M fe/src/main/java/org/apache/impala/planner/DistributedPlanner.java M testdata/workloads/functional-planner/queries/PlannerTest/joins.test 2 files changed, 37 insertions(+), 1 deletion(-) git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/03/6803/1 -- To view, visit http://gerrit.cloudera.org:8080/6803 To unsubscribe, visit http://gerrit.cloudera.org:8080/settings Gerrit-MessageType: newchange Gerrit-Change-Id: Ie168ecfcd5e7c5d3c60d16926c151f8f134c81e0 Gerrit-PatchSet: 1 Gerrit-Project: Impala-ASF Gerrit-Branch: master Gerrit-Owner: Thomas Tauber-Marshall <tmarsh...@cloudera.com>
