http://stackoverflow.com/questions/35324049/how-do-i-collect-a-list-of-strings-from-spark-dataframe-column-after-a-groupby-o spark dataframe groupby list
http://stackoverflow.com/questions/35324049/how-do-i-collect-a-list-of-strings-from-spark-dataframe-column-after-a-groupby-o spark dataframe groupby list
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