[Impala-ASF-CR] IMPALA-11803: Fix hitting DCHECK when running union on empty table with MT DOP>1

["Anonymous Coward (Code Review)" <ge...@cloudera.org>]

pranav.lodha@cloudera.com has uploaded a new patch set (#4). ( http://gerrit.cloudera.org:8080/19474 )

Change subject: IMPALA-11803: Fix hitting DCHECK when running union on empty table with MT_DOP>1
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IMPALA-11803: Fix hitting DCHECK when running union on empty table with MT_DOP>1

The DCHECK was caused as the value of useMtScanNode_
was not getting set for empty tables. This was because of
a condition for empty tables that returned from the
computeNodeResourceProfile() function before setting up
useMtScanNode_. It got rectified by placing the
assignment of useMtScanNode_ before that condition. The
fix is also verified with an end-to-end test in test_mt_dop.py.

Change-Id: Idbae5e1a78211327a214b2d936743bda767ae3c4
---
M fe/src/main/java/org/apache/impala/planner/HdfsScanNode.java
M tests/custom_cluster/test_mt_dop.py
2 files changed, 11 insertions(+), 1 deletion(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/74/19474/4
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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: Idbae5e1a78211327a214b2d936743bda767ae3c4
Gerrit-Change-Number: 19474
Gerrit-PatchSet: 4
Gerrit-Owner: Anonymous Coward <pr...@cloudera.com>
Gerrit-Reviewer: Anonymous Coward <pr...@cloudera.com>
Gerrit-Reviewer: Daniel Becker <da...@cloudera.com>
Gerrit-Reviewer: Impala Public Jenkins <im...@cloudera.com>
Gerrit-Reviewer: Joe McDonnell <jo...@cloudera.com>
Gerrit-Reviewer: Quanlong Huang <hu...@gmail.com>