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ユーザー定義関数で「groupby(key).agg(」を使用するにはどうすればよいですか?具体的には、キーごとにすべての一意の値のリストが必要です [カウントしない]。
私がpyspark.sql.functions.collect_set(col)望んでいた仕事をするものを見つけました。
pyspark.sql.functions.collect_set(col)
Hopefully simple java question I've just forgotten or never understood. I've been playing with Loaders in Android 4.0. The program is working as was but now I'm looking to the 'next' part. I wan