[kudu-CR] WIP KUDU-1261 introduce nested types for ColumnSchemaPB

["Alexey Serbin (Code Review)" <ge...@cloudera.org>]

Hello Kudu Jenkins, Abhishek Chennaka, 

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

    http://gerrit.cloudera.org:8080/22925

to look at the new patch set (#2).

Change subject: WIP KUDU-1261 introduce nested types for ColumnSchemaPB
......................................................................

WIP KUDU-1261 introduce nested types for ColumnSchemaPB

This changelist introduces changes in the common protobuf structures
to allow for columns of nested data types in Kudu tables.  At the time
of writing, we are planning to support only one-dimensional arrays
of scalar types as a first phase, but it's possible to extend the newly
introduced protobuf messages to support structures, maps, and type
nesting as necessary: I added TODOs in the comments.

Follow-up patches will start using the auto-generated bindings,
but this changelist is focused on introducing protobuf-related
changes only.

WIP:
  * collect & address feedback

Change-Id: Icf5f32c4291e7906ffb68070bee0d5369fab36fd
---
M src/kudu/common/common.proto
1 file changed, 32 insertions(+), 0 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/25/22925/2
-- 
To view, visit http://gerrit.cloudera.org:8080/22925
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Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: Icf5f32c4291e7906ffb68070bee0d5369fab36fd
Gerrit-Change-Number: 22925
Gerrit-PatchSet: 2
Gerrit-Owner: Alexey Serbin <al...@apache.org>
Gerrit-Reviewer: Abhishek Chennaka <ac...@cloudera.com>
Gerrit-Reviewer: Alexey Serbin <al...@apache.org>
Gerrit-Reviewer: Kudu Jenkins (120)