Pivot String column on Pyspark Dataframe

Question

I have a simple dataframe like this:

rdd = sc.parallelize(
    [
        (0, \"A\", 223,\"201603\", \"PORT\"), 
        (0, \"A\", 22,\"201602\", \"PORT\"),          


        

Answer 1

Assuming that (id |type | date) combinations are unique and your only goal is pivoting and not aggregation you can use first (or any other function not restricted to numeric values):

from pyspark.sql.functions import first

(df_data
    .groupby(df_data.id, df_data.type)
    .pivot("date")
    .agg(first("ship"))
    .show())

## +---+----+------+------+------+
## | id|type|201601|201602|201603|
## +---+----+------+------+------+
## |  2|   C|  DOCK|  null|  null|
## |  0|   A|  DOCK|  PORT|  PORT|
## |  1|   B|  PORT|  DOCK|  null|
## +---+----+------+------+------+

If these assumptions is not correct you'll have to pre-aggregate your data. For example for the most common ship value:

from pyspark.sql.functions import max, struct

(df_data
    .groupby("id", "type", "date", "ship")
    .count()
    .groupby("id", "type")
    .pivot("date")
    .agg(max(struct("count", "ship")))
    .show())

## +---+----+--------+--------+--------+
## | id|type|  201601|  201602|  201603|
## +---+----+--------+--------+--------+
## |  2|   C|[1,DOCK]|    null|    null|
## |  0|   A|[1,DOCK]|[1,PORT]|[1,PORT]|
## |  1|   B|[1,PORT]|[1,DOCK]|    null|
## +---+----+--------+--------+--------+