Tim Armstrong has uploaded a new patch set (#5).

Change subject: PREVIEW: IMPALA-2615: support [[nodiscard]] on Status
......................................................................

PREVIEW: IMPALA-2615: support [[nodiscard]] on Status

This is the set of changes required to get Impala to compile on
GCC 7 using the [[nodiscard]] attribute, which generates a warning
whenever a status is dropped. It is not enabled on the current
default compiler GCC 4.9.2 or Clang 3.8 so I added WARN_UNUSED_RESULT
in various classes so that we can catch the dropped statuses with
our current toolchain.

The changes are:
* Use the new [[nodiscard]] attribute and fix all the dropped
  statuses. Many were innocuous or very improbably but some appear to
  be actual bugs. Adds a discard_result() function that explicitly
  ignores the result of a function.
* Fix miscellaneous compile errors and warnings.
* Remove use of ptr_vector, which pulls in headers with deprecated
  things.
* Fix a memory lifetime bug with default_fs_ (it was masked by
  the old refcounted std::string implementation).

Change-Id: I972543af2e9f98b12dcbb5479b4c1a7d53952197
---
M be/CMakeLists.txt
M be/src/benchmarks/bit-packing-benchmark.cc
M be/src/benchmarks/expr-benchmark.cc
M be/src/benchmarks/hash-benchmark.cc
M be/src/benchmarks/network-perf-benchmark.cc
M be/src/benchmarks/row-batch-serialize-benchmark.cc
M be/src/catalog/catalog-server.cc
M be/src/catalog/catalog-util.cc
M be/src/catalog/catalogd-main.cc
M be/src/codegen/codegen-symbol-emitter.cc
M be/src/codegen/llvm-codegen-test.cc
M be/src/common/compiler-util.h
M be/src/common/init.cc
M be/src/common/status.h
M be/src/exec/hbase-scan-node.cc
M be/src/exec/hbase-table-scanner.cc
M be/src/exec/hbase-table-scanner.h
M be/src/exec/hdfs-scan-node.cc
M be/src/exec/kudu-scan-node.cc
M be/src/exec/kudu-table-sink.cc
M be/src/exec/kudu-table-sink.h
M be/src/exec/kudu-util.h
M be/src/experiments/compression-test.cc
M be/src/exprs/expr-codegen-test.cc
M be/src/exprs/expr-test.cc
M be/src/rpc/auth-provider.h
M be/src/rpc/thrift-client.cc
M be/src/rpc/thrift-client.h
M be/src/runtime/buffered-tuple-stream-test.cc
M be/src/runtime/bufferpool/buffer-pool-test.cc
M be/src/runtime/client-cache.cc
M be/src/runtime/client-cache.h
M be/src/runtime/collection-value-builder.h
M be/src/runtime/coordinator-backend-state.cc
M be/src/runtime/data-stream-recvr.cc
M be/src/runtime/data-stream-test.cc
M be/src/runtime/disk-io-mgr.cc
M be/src/runtime/exec-env.cc
M be/src/runtime/exec-env.h
M be/src/runtime/fragment-instance-state.cc
M be/src/runtime/hbase-table-factory.cc
M be/src/runtime/parallel-executor.cc
M be/src/runtime/tmp-file-mgr-test.cc
M be/src/runtime/tmp-file-mgr.cc
M be/src/scheduling/scheduler-test-util.cc
M be/src/scheduling/scheduler-test.cc
M be/src/service/client-request-state.cc
M be/src/service/fe-support.cc
M be/src/service/impala-beeswax-server.cc
M be/src/service/impala-hs2-server.cc
M be/src/service/impala-http-handler.cc
M be/src/service/impala-server.cc
M be/src/service/impalad-main.cc
M be/src/service/query-options-test.cc
M be/src/statestore/statestore.cc
M be/src/statestore/statestore.h
M be/src/statestore/statestored-main.cc
M be/src/testutil/death-test-util.h
M be/src/testutil/fault-injection-util.cc
M be/src/testutil/impalad-query-executor.cc
M be/src/testutil/in-process-servers.cc
M be/src/testutil/in-process-servers.h
M be/src/util/benchmark.cc
M be/src/util/bit-util-test.cc
M be/src/util/codec.h
M be/src/util/filesystem-util.h
M be/src/util/hdfs-util-test.cc
M be/src/util/jni-util.h
M be/src/util/memory-metrics.h
M be/src/util/metrics-test.cc
M be/src/util/network-util.h
M be/src/util/parquet-reader.cc
M be/src/util/runtime-profile.cc
M be/src/util/runtime-profile.h
M be/src/util/thread-pool.h
M be/src/util/thread.cc
M be/src/util/thread.h
77 files changed, 380 insertions(+), 278 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/53/7253/5
-- 
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I972543af2e9f98b12dcbb5479b4c1a7d53952197
Gerrit-PatchSet: 5
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Tim Armstrong <tarmstr...@cloudera.com>

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