CODEWITHSUNDEEP
pythonapache-sparkpyspark
ARCrow
ARCrow

Reputation: 1857

How to concat a StringType column with every element of an ArrayType column in pyspark

I have a StringType() column and an ArrayType(StringType()) column in a pyspark dataframe. I want to concat the StringType() column with every element of the ArrayType(StringType()) column.
Example:

+-----+---------------------+------------------------------+
|col1 |col2                 |col3                          |
+-----+---------------------+------------------------------+
|'AQQ'|['ABC', 'DEF']       |['AQQABC', 'AQQDEF']          |
|'APP'|['ABC', 'DEF', 'GHI']|['APPABC', 'APPDEF', 'APPGHI']|
+-----+---------------------+------------------------------+

Thanks :)

Upvotes: 0

Views: 70

Answers (1)

jxc
jxc

Reputation: 13998

for spark 2.4+, use transform:

from pyspark.sql.functions import expr 

df = spark.createDataFrame([('AQQ', ['ABC', 'DEF']),('APP', ['ABC', 'DEF', 'GHI'])], ['col1', 'col2'])

df.withColumn('col3', expr("transform(col2, x -> concat(col1, x))")).show(truncate=False)                            
+----+---------------+------------------------+
|col1|col2           |col3                    |
+----+---------------+------------------------+
|AQQ |[ABC, DEF]     |[AQQABC, AQQDEF]        |
|APP |[ABC, DEF, GHI]|[APPABC, APPDEF, APPGHI]|
+----+---------------+------------------------+

Upvotes: 1

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