Joe McDonnell has submitted this change and it was merged. ( 
http://gerrit.cloudera.org:8080/23495 )

Change subject: IMPALA-14473: Fix absolute path logic for sorting scan ranges 
oldest to newest
......................................................................

IMPALA-14473: Fix absolute path logic for sorting scan ranges oldest to newest

When IMPALA-14462 added tie-breaking logic to
ScanRangeOldestToNewestComparator, it relied on absolute path
being unset if the relative path is set. However, the code
always sets absolute path and uses an empty string to indicate
whether it is set. This caused the tie-breaking logic to see
two unrelated scan ranges as equal, triggering a DCHECK when
running query_test/test_tuple_cache_tpc_queries.py.

The fix is to rearrange the logic to check whether the relative
path is not empty rather than checking whether the absolute
path is set.

Testing:
 - Ran query_test/test_tuple_cache_tpc_queries.py
 - Ran custom_cluster/test_tuple_cache.py

Change-Id: I449308f4a0efdca7fc238e3dda24985a2931dd37
Reviewed-on: http://gerrit.cloudera.org:8080/23495
Reviewed-by: Michael Smith <[email protected]>
Tested-by: Impala Public Jenkins <[email protected]>
Reviewed-by: Yida Wu <[email protected]>
Reviewed-by: Joe McDonnell <[email protected]>
---
M be/src/scheduling/scheduler.cc
1 file changed, 16 insertions(+), 7 deletions(-)

Approvals:
  Michael Smith: Looks good to me, but someone else must approve
  Impala Public Jenkins: Verified
  Yida Wu: Looks good to me, but someone else must approve
  Joe McDonnell: Looks good to me, approved

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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: merged
Gerrit-Change-Id: I449308f4a0efdca7fc238e3dda24985a2931dd37
Gerrit-Change-Number: 23495
Gerrit-PatchSet: 2
Gerrit-Owner: Joe McDonnell <[email protected]>
Gerrit-Reviewer: Impala Public Jenkins <[email protected]>
Gerrit-Reviewer: Joe McDonnell <[email protected]>
Gerrit-Reviewer: Kurt Deschler <[email protected]>
Gerrit-Reviewer: Michael Smith <[email protected]>
Gerrit-Reviewer: Yida Wu <[email protected]>

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