Impala Public Jenkins has submitted this change and it was merged. ( 
http://gerrit.cloudera.org:8080/19138 )

Change subject: IMPALA-11655: Impala should set write mode "merge-on-read" by 
default
......................................................................

IMPALA-11655: Impala should set write mode "merge-on-read" by default

Similarly to HIVE-26596 Impala should set merge-on-read write mode
for V2 tables, unless otherwise specified:

* during table creation with 'format-version'='2'
* during alter table set tblproperties 'format-version'='2'

We do so because in the foreseeable future Impala will only support
merge-on-read (on the write-side, on the read side copy-on-write is
also supported). Also, currently Hive only supports merge-on-read.

Testing:
 * e2e tests added

Change-Id: Icaa32472cde98e21fb23f5461175db1bf401db3d
Reviewed-on: http://gerrit.cloudera.org:8080/19138
Reviewed-by: Impala Public Jenkins <[email protected]>
Tested-by: Impala Public Jenkins <[email protected]>
---
M fe/src/main/java/org/apache/impala/analysis/CreateTableStmt.java
M fe/src/main/java/org/apache/impala/catalog/IcebergTable.java
M fe/src/main/java/org/apache/impala/service/CatalogOpExecutor.java
M fe/src/main/java/org/apache/impala/util/IcebergUtil.java
M testdata/workloads/functional-query/queries/QueryTest/iceberg-alter.test
M testdata/workloads/functional-query/queries/QueryTest/show-create-table.test
6 files changed, 223 insertions(+), 0 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: Icaa32472cde98e21fb23f5461175db1bf401db3d
Gerrit-Change-Number: 19138
Gerrit-PatchSet: 4
Gerrit-Owner: Zoltan Borok-Nagy <[email protected]>
Gerrit-Reviewer: Impala Public Jenkins <[email protected]>
Gerrit-Reviewer: Riza Suminto <[email protected]>
Gerrit-Reviewer: Tamas Mate <[email protected]>
Gerrit-Reviewer: Zoltan Borok-Nagy <[email protected]>

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