[Impala-ASF-CR] IMPALA-5812: Fix NPE when joining on empty const select

["Bikramjeet Vig (Code Review)" <ge...@cloudera.org>]

Bikramjeet Vig has uploaded a new patch set (#2).

Change subject: IMPALA-5812: Fix NPE when joining on empty const select
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IMPALA-5812: Fix NPE when joining on empty const select

A NPE is thrown during the creation of the single node plan of a query
consisting of a cross join with a constant select that returns
an empty result set. This happens because when an empty-set plan node
is created, its tupleIds_ and tblRefIds_ are initialized with the
tuple ID of a newly create tuple that does not map to any existing
tableRefs. This causes a null pre-check to fail during the creation
of the join node when it tries to fetch the tableRef from that new
tuple Id in the empty-set node but doesn't find one.

Testing:
Added a planner test.

Change-Id: I6e425dbcb442aeeac687e103774823d3f50e6436
---
M fe/src/main/java/org/apache/impala/planner/SingleNodePlanner.java
M testdata/workloads/functional-planner/queries/PlannerTest/empty.test
2 files changed, 19 insertions(+), 0 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/71/7971/2
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I6e425dbcb442aeeac687e103774823d3f50e6436
Gerrit-PatchSet: 2
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Bikramjeet Vig <bi...@cloudera.com>
Gerrit-Reviewer: Alex Behm <al...@cloudera.com>