clearstorydata/shark — pull request #29 by jhartlaub (2013-08-13 23:25:32+00:00)
Title: SHARK-159: outer join on null key would output the same row value for al...

...l null key rows. (cherry-pick, conficts fixed)

Conflicts:
src/main/scala/shark/execution/MapJoinOperator.scala
src/test/scala/shark/SQLSuite.scala