nullif

Returns null if col1 equals to col2, or col1 otherwise.

For the corresponding Databricks SQL function, see nullif function.

Syntax

from pyspark.sql import functions as dbf

dbf.nullif(col1=<col1>, col2=<col2>)

Parameters

Parameter	Type	Description
col1	pyspark.sql.Column or str	The first column to check.
col2	pyspark.sql.Column or str	The column to compare with col1.

Examples

from pyspark.sql import functions as dbf
df = spark.createDataFrame([(None, None,), (1, 9,)], ["a", "b"])
df.select('*', dbf.nullif(df.a, df.b)).show()

+----+----+------------+
|   a|   b|nullif(a, b)|
+----+----+------------+
|NULL|NULL|        NULL|
|   1|   9|           1|
+----+----+------------+