duplicate a column in pyspark data frame [duplicate]

问题

This question already has answers here:

Adding a new column in Data Frame derived from other columns (Spark) (3 answers)

Closed 2 years ago.

I have a data frame in pyspark like sample below. I would like to duplicate a column in the data frame and rename to another column name.

Name    Age    Rate
Aira     23     90
Ben      32     98
Cat      27     95

Desired output is :

Name    Age     Rate     Rate2
Aira    23      90       90
Ben     32      98       98
Cat     27      95       95

How can I do it?

回答1:

Just

df.withColumn("Rate2", df["Rate"])

or (in SQL)

SELECT *, Rate AS Rate2 FROM df

来源：https://stackoverflow.com/questions/50399361/duplicate-a-column-in-pyspark-data-frame