Impala Public Jenkins has submitted this change and it was merged. ( 
http://gerrit.cloudera.org:8080/21792 )

Change subject: IMPALA-13322: Fix alter on SystemTables
......................................................................

IMPALA-13322: Fix alter on SystemTables

Fixes SystemTable.load to handle incremental loads - such as during
alter - and correctly update the metastore Table so subsequent
operations see the correct version of the table schema.

Updates QueryScanner to allow unknown columns and log a warning. This is
primarily needed when another coordinator has been upgraded and modified
table metadata with new columns that this coordinator doesn't recognize.

Adds TestQueryLive::test_alter to test that altering the table works and
the table is usable afterwards, including attempting to query unknown
columns as we might encounter them during upgrades.

Change-Id: I9a59e58c086e659941e0db8a2b893ac6dcc5143a
Reviewed-on: http://gerrit.cloudera.org:8080/21792
Reviewed-by: Impala Public Jenkins <[email protected]>
Tested-by: Impala Public Jenkins <[email protected]>
---
M be/src/exec/system-table-scanner.cc
M be/src/exec/system-table-scanner.h
M fe/src/main/java/org/apache/impala/catalog/SystemTable.java
M tests/custom_cluster/test_query_live.py
4 files changed, 78 insertions(+), 18 deletions(-)

Approvals:
  Impala Public Jenkins: Looks good to me, approved; Verified

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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: merged
Gerrit-Change-Id: I9a59e58c086e659941e0db8a2b893ac6dcc5143a
Gerrit-Change-Number: 21792
Gerrit-PatchSet: 9
Gerrit-Owner: Michael Smith <[email protected]>
Gerrit-Reviewer: Impala Public Jenkins <[email protected]>
Gerrit-Reviewer: Jason Fehr <[email protected]>
Gerrit-Reviewer: Michael Smith <[email protected]>
Gerrit-Reviewer: Quanlong Huang <[email protected]>
Gerrit-Reviewer: Wenzhe Zhou <[email protected]>

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