[SPARK-10050][SPARKR] Support collecting data of MapType in DataFrame.#8711

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sun-rui wants to merge 6 commits intoapache:masterfrom

sun-rui:SPARK-10050

Commits on Sep 11, 2015

[SPARK-10050][SPARKR] Support collecting data of MapType in DataFrame.
Sun Rui
committed
Extract common logic into a new private method: writeKeyValue().
Sun Rui
committed
Fix scala style.
Sun Rui
committed

Commits on Sep 14, 2015

Check if key type of a map is string when creating structField in R.
Sun Rui
committed

Commits on Sep 15, 2015

Add a test case for checking map type.
Sun Rui
committed
Fix R style.
Sun Rui
committed