[SPARK-4459] Change groupBy type parameter from K to U#3327

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alokito wants to merge 4 commits intoapache:masterfrom

Commits on Nov 17, 2014

SPARK-4459 added failing unit test
Saldanha
committed
SPARK-4459 changed type parameter for groupBy from K to U.
Saldanha
committed

Commits on Nov 18, 2014

[SPARK-4459] added keyBy test
Saldanha
committed
[SPARK-4459] changed type parameter for keyBy from K to U
Saldanha
committed