PySpark: DataFrame - Convert Struct to Array

问题

I have a dataframe in the following structure:

root
 |-- index: long (nullable = true)
 |-- text: string (nullable = true)
 |-- topicDistribution: struct (nullable = true)
 |    |-- type: long (nullable = true)
 |    |-- values: array (nullable = true)
 |    |    |-- element: double (containsNull = true)
 |-- wiki_index: string (nullable = true)

I need to change it to:

root
 |-- index: long (nullable = true)
 |-- text: string (nullable = true)
 |-- topicDistribution: array (nullable = true)
 |    |--  element: double (containsNull = true)
 |-- wiki_index: string (nullable = true)

May I ask how can I do that?

Thanks a lot.

回答1:

I think you're looking for

df.withColumn("topicDistribution", col("topicDistribution").getField("values"))

来源：https://stackoverflow.com/questions/47616606/pyspark-dataframe-convert-struct-to-array