Hello Marcel Kornacker,
I'd like you to reexamine a change. Please visit
http://gerrit.cloudera.org:8080/6803
to look at the new patch set (#2).
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, 24 insertions(+), 1 deletion(-)
git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/03/6803/2
--
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: Ie168ecfcd5e7c5d3c60d16926c151f8f134c81e0
Gerrit-PatchSet: 2
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Thomas Tauber-Marshall <[email protected]>
Gerrit-Reviewer: Alex Behm <[email protected]>
Gerrit-Reviewer: Marcel Kornacker <[email protected]>
