Impala Public Jenkins has submitted this change and it was merged. ( 
http://gerrit.cloudera.org:8080/8403 )

Change subject: IMPALA-6093: diagnostics for flaky TestHashJoinTimer
......................................................................

IMPALA-6093: diagnostics for flaky TestHashJoinTimer

We don't know the root cause yet but try to improve things:
* Eliminate one possible cause of flakiness - unfinished fragments left
  from previous queries.
* Print a profile if an assertion fails so we can see why it failed.

Testing:
Ran core tests.

Change-Id: Ic332dddd96931db807abb960db43b99e5fd0f256
Reviewed-on: http://gerrit.cloudera.org:8080/8403
Reviewed-by: Tim Armstrong <[email protected]>
Tested-by: Impala Public Jenkins
---
M tests/query_test/test_hash_join_timer.py
1 file changed, 18 insertions(+), 6 deletions(-)

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

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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: merged
Gerrit-Change-Id: Ic332dddd96931db807abb960db43b99e5fd0f256
Gerrit-Change-Number: 8403
Gerrit-PatchSet: 4
Gerrit-Owner: Tim Armstrong <[email protected]>
Gerrit-Reviewer: Bikramjeet Vig <[email protected]>
Gerrit-Reviewer: Impala Public Jenkins
Gerrit-Reviewer: Tim Armstrong <[email protected]>

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