就是explode这样：
from pyspark.sql.functions import explode
documents.withColumn("title", explode("title"))
## +---+----------------+
## | id| title|
## +---+----------------+
## | 1| [1000,cars]|
## | 2| [50,horse bus]|
## | 2|[100,normal bus]|
## | 3| [5000,Airplane]|
## | 4| [20,Bicycles]|
## | 4| [80,Motorbikes]|
## | 5| [15,Trams]|
## +---+----------------+
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