[Impala-ASF-CR] IMPALA-4335: Don't send 0-row batches to clients

["Henry Robinson (Code Review)" <ge...@cloudera.org>]

Hello Matthew Jacobs, Alex Behm, Dan Hecht,

I'd like you to reexamine a change.  Please visit

    http://gerrit.cloudera.org:8080/4787

to look at the new patch set (#4).

Change subject: IMPALA-4335: Don't send 0-row batches to clients
......................................................................

IMPALA-4335: Don't send 0-row batches to clients

This patch restores some behaviour from pre-IMPALA-2905 where we would
not send 0-row batches to the client. Although 0-row batches are legal,
they're not very useful for clients to receive (and clients may not
correctly process them).

No query was found which reliably produced 0-row batches, so no test is
added.

Change-Id: I7d339c1f9a55d9d75fb0e97d16b3176cc34f2171
---
M be/src/exec/plan-root-sink.cc
M be/src/runtime/coordinator.h
2 files changed, 6 insertions(+), 3 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/87/4787/4
-- 
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I7d339c1f9a55d9d75fb0e97d16b3176cc34f2171
Gerrit-PatchSet: 4
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Henry Robinson <he...@cloudera.com>
Gerrit-Reviewer: Alex Behm <al...@cloudera.com>
Gerrit-Reviewer: Dan Hecht <dh...@cloudera.com>
Gerrit-Reviewer: Henry Robinson <he...@cloudera.com>
Gerrit-Reviewer: Matthew Jacobs <mj...@cloudera.com>