[SPARK-12200][SQL] Add __contains__ implementation to Row
[SPARK-12200][SQL] Add __contains__ implementation to Row

https://issues.apache.org/jira/browse/SPARK-12200

Author: Maciej Brynski <maciej.brynski@adpilot.pl>
Author: Maciej Bryński <maciek-github@brynski.pl>

Closes #10194 from maver1ck/master.

(cherry picked from commit 7ecd496884f6f126ab186b9ceaa861a571d6155c)
Signed-off-by: Reynold Xin <c9d35a384bc579d1c6c8c055f2a2b5c04e11b521@databricks.com>

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