[Impala-ASF-CR] IMPALA-3586 (Part 1): Implement Union Pass Through

["Taras Bobrovytsky (Code Review)" <ge...@cloudera.org>]

Taras Bobrovytsky has uploaded a new patch set (#4).

Change subject: IMPALA-3586 (Part 1): Implement Union Pass Through
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IMPALA-3586 (Part 1): Implement Union Pass Through

The union node acts as pass through operator and forwards row batches
from it's children without materializing. This is done in the case
when the child's tuple layout is identical to union node tuple layout
and no functions need to be applied to the child row batches.

Testing:
Verified that existing tests cover the case where no/some/all union
children of the union node can be passed through.

Change-Id: Ia8f6d5062724ba5b78174c3227a7a796d10d8416
---
M be/src/exec/union-node.cc
M be/src/exec/union-node.h
M be/src/runtime/descriptors.cc
M common/thrift/PlanNodes.thrift
M fe/src/main/java/org/apache/impala/analysis/SlotDescriptor.java
M fe/src/main/java/org/apache/impala/analysis/UnionStmt.java
M fe/src/main/java/org/apache/impala/planner/SingleNodePlanner.java
M fe/src/main/java/org/apache/impala/planner/UnionNode.java
M testdata/workloads/functional-planner/queries/PlannerTest/aggregation.test
M testdata/workloads/functional-planner/queries/PlannerTest/analytic-fns.test
M testdata/workloads/functional-planner/queries/PlannerTest/empty.test
M testdata/workloads/functional-planner/queries/PlannerTest/inline-view.test
M testdata/workloads/functional-planner/queries/PlannerTest/order.test
M testdata/workloads/functional-planner/queries/PlannerTest/predicate-propagation.test
M testdata/workloads/functional-planner/queries/PlannerTest/runtime-filter-propagation.test
M testdata/workloads/functional-planner/queries/PlannerTest/small-query-opt.test
M testdata/workloads/functional-planner/queries/PlannerTest/subquery-rewrite.test
M testdata/workloads/functional-planner/queries/PlannerTest/topn.test
M testdata/workloads/functional-planner/queries/PlannerTest/union.test
M testdata/workloads/functional-query/queries/QueryTest/union.test
20 files changed, 435 insertions(+), 15 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/16/5816/4
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: Ia8f6d5062724ba5b78174c3227a7a796d10d8416
Gerrit-PatchSet: 4
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Taras Bobrovytsky <tb...@cloudera.com>
Gerrit-Reviewer: Alex Behm <al...@cloudera.com>
Gerrit-Reviewer: Taras Bobrovytsky <tb...@cloudera.com>
Gerrit-Reviewer: Tim Armstrong <ta...@cloudera.com>