Andrew Wong has submitted this change and it was merged. ( 
http://gerrit.cloudera.org:8080/15042 )

Change subject: cfile: change BlockBuilder API to yield a vector of Slices
......................................................................

cfile: change BlockBuilder API to yield a vector of Slices

When blocks are appended to cfiles at the IO layer, we already have the
ability to write multiple slices using a vectored IO. Prior to this
patch, the BlockBuilder API was restricted to returning a single slice,
whereas it would be more convenient in some cases to be able to return
multiple slices (eg separating the header from the data).

This new functionality is used by BinaryDictBlockBuilder to avoid an
extra copy in Finish().

Change-Id: Ifc7a5f148a4a43cedac2428f4c1a18d0f93a10db
Reviewed-on: http://gerrit.cloudera.org:8080/15042
Reviewed-by: Andrew Wong <[email protected]>
Tested-by: Kudu Jenkins
---
M src/kudu/cfile/binary_dict_block.cc
M src/kudu/cfile/binary_dict_block.h
M src/kudu/cfile/binary_plain_block.cc
M src/kudu/cfile/binary_plain_block.h
M src/kudu/cfile/binary_prefix_block.cc
M src/kudu/cfile/binary_prefix_block.h
M src/kudu/cfile/block_encodings.h
M src/kudu/cfile/bshuf_block.cc
M src/kudu/cfile/bshuf_block.h
M src/kudu/cfile/cfile_writer.cc
M src/kudu/cfile/encoding-test.cc
M src/kudu/cfile/plain_bitmap_block.h
M src/kudu/cfile/plain_block.h
M src/kudu/cfile/rle_block.h
14 files changed, 115 insertions(+), 107 deletions(-)

Approvals:
  Andrew Wong: Looks good to me, approved
  Kudu Jenkins: Verified

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Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-MessageType: merged
Gerrit-Change-Id: Ifc7a5f148a4a43cedac2428f4c1a18d0f93a10db
Gerrit-Change-Number: 15042
Gerrit-PatchSet: 8
Gerrit-Owner: Todd Lipcon <[email protected]>
Gerrit-Reviewer: Alexey Serbin <[email protected]>
Gerrit-Reviewer: Andrew Wong <[email protected]>
Gerrit-Reviewer: Bankim Bhavsar <[email protected]>
Gerrit-Reviewer: Kudu Jenkins (120)
Gerrit-Reviewer: Todd Lipcon <[email protected]>

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