[Impala-ASF-CR] IMPALA-6080: clean up table descriptor handling

["Tim Armstrong (Code Review)" <ge...@cloudera.org>]

Tim Armstrong has uploaded a new patch set (#2). ( http://gerrit.cloudera.org:8080/8330 )

Change subject: IMPALA-6080: clean up table descriptor handling
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IMPALA-6080: clean up table descriptor handling

* Add DescriptorTbl::CreateHdfsTableDescriptor to avoid having to
   create an entire DescriptorTbl during INSERT finalization (when only
   a descriptor for the output table is needed)
* Remove TQueryExecRequest.desc_tbl, there's already a home for it in
   TQueryContext.desc_tbl

This required fixing a problem in the planner test infrastructure
where the TQueryCtx was reused for planning multiple times despite
being modified during planning.

This is based on Marcel Kornacker's coordinator cleanup
patch.

Testing:
Ran core tests.

Change-Id: Id427dab0c196b556bd8b2d64ec618403d5cbd4d6
---
M be/src/benchmarks/expr-benchmark.cc
M be/src/runtime/coordinator.cc
M be/src/runtime/descriptors.cc
M be/src/runtime/descriptors.h
M common/thrift/Frontend.thrift
M fe/src/main/java/org/apache/impala/service/Frontend.java
M fe/src/test/java/org/apache/impala/planner/PlannerTestBase.java
7 files changed, 119 insertions(+), 106 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/30/8330/2
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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: Id427dab0c196b556bd8b2d64ec618403d5cbd4d6
Gerrit-Change-Number: 8330
Gerrit-PatchSet: 2
Gerrit-Owner: Tim Armstrong <ta...@cloudera.com>