0
+-------------------+
|           Dev_time|
+-------------------+
|2015-09-18 05:00:20|
|2015-09-18 05:00:21|
|2015-09-18 05:00:22|
|2015-09-18 05:00:23|
|2015-09-18 05:00:24|
|2015-09-18 05:00:25|
|2015-09-18 05:00:26|
|2015-09-18 05:00:27|
|2015-09-18 05:00:37|
|2015-09-18 05:00:37|
|2015-09-18 05:00:37|
|2015-09-18 05:00:38|
|2015-09-18 05:00:39|
+-------------------+

スパークのデータフレームの場合、次のように日時の差分を計算したいnumpy.diff(array)

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