Hello Quanlong Huang, Daniel Becker, Csaba Ringhofer, Impala Public Jenkins,

I'd like you to reexamine a change. Please visit

    http://gerrit.cloudera.org:8080/22487

to look at the new patch set (#3).

Change subject: IMPALA-13758: Use context manager in 
ImpalaTestSuite.change_database
......................................................................

IMPALA-13758: Use context manager in ImpalaTestSuite.change_database

ImpalaTestSuite.change_database is responsible to point impala client to
database under test. However, it left client pointing to that database
after the test without reverting them back to default database. This
patch does the reversal by changing ImpalaTestSuite.change_database to
use context manager.

This patch change the behavior of execute_query_using_client() and
execute_query_async_using_client(). They used to change database
according to the given vector parameter, but not anymore after this
patch. In practice, this behavior change does not affect many tests
because most queries going through these functions already use fully
qualified table name. Going forward, querying through function other
than run_test_case() should try to use fully qualified table name as
much as possible.

Retain behavior of ImpalaTestSuite._get_table_location() since there are
considerable number of tests relies on it (changing database when
called).

Removed unused test fixtures and fixed several flake8 issues in modified
test files.

Testing:
- Moved nested-types-subplan-single-node.test. This allows the test
  framework to point to the right tpch_nested* database.
- Pass exhaustive test except IMPALA-13752 and IMPALA-13761. They will
  be fixed in separate patch.

Change-Id: I75bec7403cc302728a630efe3f95e852a84594e2
---
R 
testdata/workloads/tpch_nested/queries/QueryTest/nested-types-subplan-single-node.test
M tests/common/impala_test_suite.py
M tests/common/test_vector.py
M tests/conftest.py
M tests/custom_cluster/test_admission_controller.py
M tests/custom_cluster/test_blacklisted_dbs_and_tables.py
M tests/custom_cluster/test_data_cache.py
M tests/failure/test_failpoints.py
M tests/query_test/test_aggregation.py
M tests/query_test/test_cancellation.py
M tests/query_test/test_mem_usage_scaling.py
M tests/query_test/test_mt_dop.py
M tests/query_test/test_nested_types.py
M tests/query_test/test_runtime_filters.py
M tests/query_test/test_scanners.py
M tests/query_test/test_tablesample.py
M tests/util/cancel_util.py
17 files changed, 207 insertions(+), 144 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/87/22487/3
--
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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I75bec7403cc302728a630efe3f95e852a84594e2
Gerrit-Change-Number: 22487
Gerrit-PatchSet: 3
Gerrit-Owner: Riza Suminto <[email protected]>
Gerrit-Reviewer: Csaba Ringhofer <[email protected]>
Gerrit-Reviewer: Daniel Becker <[email protected]>
Gerrit-Reviewer: Impala Public Jenkins <[email protected]>
Gerrit-Reviewer: Quanlong Huang <[email protected]>
Gerrit-Reviewer: Riza Suminto <[email protected]>

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