Impala Public Jenkins has submitted this change and it was merged. ( 
http://gerrit.cloudera.org:8080/23803 )

Change subject: IMPALA-14638: Schedule union of iceberg metadata scanner to 
coordinator
......................................................................

IMPALA-14638: Schedule union of iceberg metadata scanner to coordinator

On clusters with dedicated coordinators and executors the Iceberg
metadata scanner fragment(s) must be scheduled to coordinators.
IMPALA-12809 ensured this for most plans, but if the Iceberg metadata
scanner is part of a union of unpartitioned fragments a new fragment is
created for the union that subsumes existing fragments and loses the
coordinatorOnly flag.

Fixes cases where a multi-fragment plan includes a union of iceberg
metadata scans by setting coordinatorOnly on the new union fragment.
Adds new planner and runtime tests for this case.

Change-Id: If2f19945037b4a7a6433cd9c6e7e2b352fae7356
Reviewed-on: http://gerrit.cloudera.org:8080/23803
Reviewed-by: Impala Public Jenkins <[email protected]>
Tested-by: Impala Public Jenkins <[email protected]>
---
M fe/src/main/java/org/apache/impala/planner/DistributedPlanner.java
M 
testdata/workloads/functional-planner/queries/PlannerTest/iceberg-metadata-table-joined-with-regular-table.test
M tests/custom_cluster/test_coordinators.py
3 files changed, 110 insertions(+), 1 deletion(-)

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: If2f19945037b4a7a6433cd9c6e7e2b352fae7356
Gerrit-Change-Number: 23803
Gerrit-PatchSet: 5
Gerrit-Owner: Michael Smith <[email protected]>
Gerrit-Reviewer: Daniel Becker <[email protected]>
Gerrit-Reviewer: Gabor Kaszab <[email protected]>
Gerrit-Reviewer: Impala Public Jenkins <[email protected]>
Gerrit-Reviewer: Michael Smith <[email protected]>
Gerrit-Reviewer: Noemi Pap-Takacs <[email protected]>
Gerrit-Reviewer: Peter Rozsa <[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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