Support type-stable map and combine on GroupedDataFrame#1601

Merged

nalimilan merged 16 commits intomasterfrom nl/select

Dec 3, 2018

+708-204

Commits on Nov 17, 2018

Support type-stable map and combine on GroupedDataFrame via select argument
nalimilan
committed

Commits on Nov 22, 2018

Switch to Pair
nalimilan
committed

Commits on Nov 23, 2018

Commits on Nov 24, 2018

Review fixes + new tests
nalimilan
committed

Commits on Dec 2, 2018

Commits on Dec 3, 2018

Pair is also allowed
nalimilan
committed