[kudu-CR](branch-0.7.0) [python] - Allow to scan null values

["David Ribeiro Alves (Code Review)" <ge...@ip-10-146-233-104.ec2.internal>]

Hello Kudu Jenkins,

I'd like you to do a code review.  Please visit

    http://gerrit.cloudera.org:8080/2039

to review the following change.

Change subject: [python] - Allow to scan null values
......................................................................

[python] - Allow to scan null values

Currently scanning a column with null values causes a crash when
the client tries to get the null value.

This adds an is_null() check so that we add 'None' to the tuple
if the value is null in the tablet.

This also alters the scanner test to produce and read null values.

Change-Id: If340213cf5daba50c60d271530c21b109c8cd2f3
Reviewed-on: http://gerrit.cloudera.org:8080/1989
Tested-by: Kudu Jenkins
Reviewed-by: David Ribeiro Alves <da...@cloudera.com>
---
M python/kudu/client.pyx
M python/kudu/tests/test_scanner.py
2 files changed, 14 insertions(+), 6 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/39/2039/1
-- 
To view, visit http://gerrit.cloudera.org:8080/2039
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Gerrit-MessageType: newchange
Gerrit-Change-Id: If340213cf5daba50c60d271530c21b109c8cd2f3
Gerrit-PatchSet: 1
Gerrit-Project: kudu
Gerrit-Branch: branch-0.7.0
Gerrit-Owner: David Ribeiro Alves <da...@cloudera.com>
Gerrit-Reviewer: Kudu Jenkins