how to cast all columns of dataframe to string

Question

I have a mixed type dataframe. I am reading this dataframe from hive table using spark.sql(\'select a,b,c from table\') command.

Some columns are int

Answer 1

Just:

from pyspark.sql.functions import col

table = spark.sql("table")

table.select([col(c).cast("string") for c in table.columns])