[kudu-CR] memrowset: support iteration with include deleted rows

["Adar Dembo (Code Review)" <ge...@cloudera.org>]

Hello Mike Percy, Kudu Jenkins, Grant Henke, Todd Lipcon, 

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

    http://gerrit.cloudera.org:8080/10929

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

Change subject: memrowset: support iteration with include_deleted_rows
......................................................................

memrowset: support iteration with include_deleted_rows

This is another piece in the incremental backup puzzle. The idea is that
when taking an incremental backup, the scan will include rows that have been
deleted. The backup will figure out which rows were deleted by including a
special "is deleted" virtual column in the projection.

This commit introduces a new iterator option that can be used to include
deleted rows, and uses it in the MemRowSet.

Change-Id: Ie018043518b437ecc719cf9f87b2c5eea560c9a1
---
M src/kudu/tablet/memrowset-test.cc
M src/kudu/tablet/memrowset.cc
M src/kudu/tablet/memrowset.h
M src/kudu/tablet/rowset.cc
M src/kudu/tablet/rowset.h
5 files changed, 77 insertions(+), 31 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/29/10929/4
-- 
To view, visit http://gerrit.cloudera.org:8080/10929
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Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: Ie018043518b437ecc719cf9f87b2c5eea560c9a1
Gerrit-Change-Number: 10929
Gerrit-PatchSet: 4
Gerrit-Owner: Adar Dembo <ad...@cloudera.com>
Gerrit-Reviewer: Adar Dembo <ad...@cloudera.com>
Gerrit-Reviewer: Grant Henke <gr...@apache.org>
Gerrit-Reviewer: Kudu Jenkins
Gerrit-Reviewer: Mike Percy <mp...@apache.org>
Gerrit-Reviewer: Todd Lipcon <to...@apache.org>