pyspark.sql.functions.when¶
-
pyspark.sql.functions.
when
(condition, value)[source]¶ Evaluates a list of conditions and returns one of multiple possible result expressions. If
Column.otherwise()
is not invoked, None is returned for unmatched conditions.- Parameters
condition – a boolean
Column
expression.value – a literal value, or a
Column
expression.
>>> df.select(when(df['age'] == 2, 3).otherwise(4).alias("age")).collect() [Row(age=3), Row(age=4)]
>>> df.select(when(df.age == 2, df.age + 1).alias("age")).collect() [Row(age=3), Row(age=None)]
New in version 1.4.