[Impala-ASF-CR] IMPALA-4024: Add "system" database and expose Impala metrics as a table

["Kathy Sun (Code Review)" <ge...@cloudera.org>]

Kathy Sun has uploaded a new patch set (#16).

Change subject: IMPALA-4024: Add "system" database and expose Impala metrics as a table
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IMPALA-4024: Add "system" database and expose Impala metrics as a table

This is to expose metadata (current status of impala, e.g impala-metrics)
into system table, so that users could query them via sql.
Currently, only metrics table is included.
We could add other table later, e.g. queries table

You can run impala-shell.sh and type query like:
select * from system.metrics;
select name, value, description from system.metrics;

Change-Id: I7adbeb45220c468e43b424d70c30b952f6cec2cd
---
M be/src/exec/CMakeLists.txt
M be/src/exec/exec-node.cc
A be/src/exec/system-table-scan-node.cc
A be/src/exec/system-table-scan-node.h
A be/src/exec/system-table-scanner.cc
A be/src/exec/system-table-scanner.h
M be/src/runtime/coordinator.cc
M be/src/runtime/descriptors.cc
M be/src/runtime/descriptors.h
M be/src/scheduling/simple-scheduler.cc
M be/src/scheduling/simple-scheduler.h
M be/src/service/fe-support.cc
M be/src/util/metrics.h
M common/thrift/CatalogObjects.thrift
M common/thrift/Descriptors.thrift
M common/thrift/PlanNodes.thrift
M common/thrift/StatestoreService.thrift
M fe/src/main/java/com/cloudera/impala/analysis/AnalysisContext.java
M fe/src/main/java/com/cloudera/impala/analysis/Analyzer.java
M fe/src/main/java/com/cloudera/impala/analysis/DescriptorTable.java
M fe/src/main/java/com/cloudera/impala/analysis/TupleDescriptor.java
M fe/src/main/java/com/cloudera/impala/catalog/Catalog.java
A fe/src/main/java/com/cloudera/impala/catalog/SystemDb.java
A fe/src/main/java/com/cloudera/impala/catalog/SystemTable.java
M fe/src/main/java/com/cloudera/impala/planner/SingleNodePlanner.java
A fe/src/main/java/com/cloudera/impala/planner/SystemTableScanNode.java
M fe/src/main/java/com/cloudera/impala/service/FeSupport.java
M fe/src/main/java/com/cloudera/impala/service/Frontend.java
M fe/src/test/java/com/cloudera/impala/analysis/AnalyzeStmtsTest.java
M fe/src/test/java/com/cloudera/impala/analysis/AuthorizationTest.java
M fe/src/test/java/com/cloudera/impala/planner/PlannerTest.java
M fe/src/test/resources/authz-policy.ini.template
A testdata/workloads/functional-planner/queries/PlannerTest/system-db.test
A testdata/workloads/functional-query/queries/QueryTest/system-database.test
M tests/query_test/test_scanners.py
35 files changed, 954 insertions(+), 23 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/63/3863/16
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I7adbeb45220c468e43b424d70c30b952f6cec2cd
Gerrit-PatchSet: 16
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Kathy Sun <ka...@cloudera.com>
Gerrit-Reviewer: Kathy Sun <ka...@cloudera.com>
Gerrit-Reviewer: Tim Armstrong <ta...@cloudera.com>