[Impala-ASF-CR] IMPALA-5602: Fix query optimization for kudu and datasource tables

["Bikramjeet Vig (Code Review)" <ge...@cloudera.org>]

Bikramjeet Vig has uploaded a new patch set (#4).

Change subject: IMPALA-5602: Fix query optimization for kudu and datasource tables
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IMPALA-5602: Fix query optimization for kudu and datasource tables

Fix a bug where the following queries on kudu and datasource tables
were incorrectly being optimized as a 'small query' and therefore
running on a single node with a single scanner thread:

(A) that have all their predicates pushed to the underlying storage
layer and have a limit
(B) table stats missing + Conditions in (A)

Testing:
For (A): Added a frontend planner test for kudu tables
For (B): Added an end to end planner test for kudu and a query test
for datasource tables

Change-Id: I93822d67ebda41d5d0456095c429e3915a3f40c4
---
M fe/src/main/java/org/apache/impala/planner/DataSourceScanNode.java
M fe/src/main/java/org/apache/impala/planner/KuduScanNode.java
M fe/src/main/java/org/apache/impala/planner/ScanNode.java
M fe/src/main/java/org/apache/impala/util/MaxRowsProcessedVisitor.java
M fe/src/test/java/org/apache/impala/planner/PlannerTest.java
M testdata/workloads/functional-planner/queries/PlannerTest/kudu.test
M testdata/workloads/functional-query/queries/QueryTest/data-source-tables.test
M tests/query_test/test_kudu.py
M tests/query_test/test_queries.py
9 files changed, 673 insertions(+), 256 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/60/7560/4
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I93822d67ebda41d5d0456095c429e3915a3f40c4
Gerrit-PatchSet: 4
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Bikramjeet Vig <bi...@cloudera.com>
Gerrit-Reviewer: Bikramjeet Vig <bi...@cloudera.com>
Gerrit-Reviewer: Matthew Jacobs <mj...@cloudera.com>
Gerrit-Reviewer: Tim Armstrong <ta...@cloudera.com>