Xianqing He has uploaded this change for review. ( 
http://gerrit.cloudera.org:8080/17729


Change subject: IMPALA-10825: fix impalad crashes when closing the retrying 
query
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IMPALA-10825: fix impalad crashes when closing the retrying query

The crash happens when canceling the retrying query in web UI.
The canceling action will call ImpalaServer#UnregisterQuery.
The QueryDriver will be null if the query has already been unregistered.

Testing:
 Add test in tests/custom_cluster/test_query_retries.py and manually
tested 100 times to make sure that there was no Impalad crash

Change-Id: I3b9a2cccbfbdca00b099e0f8d5f2d4bcb4d0a8c3
---
M be/src/runtime/query-driver.cc
M tests/custom_cluster/test_query_retries.py
2 files changed, 37 insertions(+), 0 deletions(-)



  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/29/17729/1
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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: newchange
Gerrit-Change-Id: I3b9a2cccbfbdca00b099e0f8d5f2d4bcb4d0a8c3
Gerrit-Change-Number: 17729
Gerrit-PatchSet: 1
Gerrit-Owner: Xianqing He <hexianqing...@126.com>

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