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I'd like you to do a code review. Please visit
http://gerrit.cloudera.org:8080/10087
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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
Reviewed-on: http://gerrit.cloudera.org:8080/9949
Reviewed-by: Tianyi Wang <[email protected]>
Tested-by: Impala Public Jenkins <[email protected]>
(cherry picked from commit 9a751f00b8a399116c12a81e130a696b01eb1ba8)
---
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/shuffle-by-distinct-exprs.test
M testdata/workloads/functional-query/queries/QueryTest/distinct.test
M tests/query_test/test_aggregation.py
9 files changed, 454 insertions(+), 24 deletions(-)
git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/87/10087/1
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Gerrit-Project: Impala-ASF
Gerrit-Branch: 2.x
Gerrit-MessageType: newchange
Gerrit-Change-Id: Icb4b4576fb29edd62cf4b4ba0719c0e0a2a5a8dc
Gerrit-Change-Number: 10087
Gerrit-PatchSet: 1
Gerrit-Owner: Tianyi Wang <[email protected]>
Gerrit-Reviewer: Impala Public Jenkins <[email protected]>
Gerrit-Reviewer: Tianyi Wang <[email protected]>
