CODEWITHSUNDEEP
apache-sparkpysparkdatabricks
Gaurav Bansal
Gaurav Bansal

Reputation: 5660

Adding constant value column to spark dataframe

I am using Spark version 2.1 in Databricks. I have a data frame named wamp to which I want to add a column named region which should take the constant value NE. However, I get an error saying NameError: name 'lit' is not defined when I run the following command: 

wamp = wamp.withColumn('region', lit('NE'))

What am I doing wrong?

Upvotes: 13

Views: 51979

Answers (2)

muon
muon

Reputation: 14067

you need to import lit

either 

from pyspark.sql.functions import *

will make lit available

or something like 

import pyspark.sql.functions as sf
wamp = wamp.withColumn('region', sf.lit('NE'))

Upvotes: 34

Joarder Kamal
Joarder Kamal

Reputation: 1397

muon@ provided the correct answer above. Just adding a quick reproducible version to increase clarity.

>>> from pyspark.sql.functions import lit
>>> df = spark.createDataFrame([(1, 4, 3)], ['a', 'b', 'c'])
>>> df.show()
+---+---+---+
|  a|  b|  c|
+---+---+---+
|  1|  4|  3|
+---+---+---+

>>> df = df.withColumn("d", lit(5))
>>> df.show()
+---+---+---+---+
|  a|  b|  c|  d|
+---+---+---+---+
|  1|  4|  3|  5|
+---+---+---+---+

Upvotes: 4

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