isnull

An expression that returns true if the column is null. Supports Spark Connect.

For the corresponding Databricks SQL function, see isnull function.

Syntax

from pyspark.sql import functions as dbf

dbf.isnull(col=<col>)

Parameters

Parameter	Type	Description
col	pyspark.sql.Column or str	Target column to compute on.

Returns

pyspark.sql.Column: True if value is null and False otherwise.

Examples

from pyspark.sql import functions as dbf
df = spark.createDataFrame([(1, None), (None, 2)], ("a", "b"))
df.select("*", dbf.isnull("a"), dbf.isnull(df.b)).show()

+----+----+-----------+-----------+
|   a|   b|(a IS NULL)|(b IS NULL)|
+----+----+-----------+-----------+
|   1|NULL|      false|       true|
|NULL|   2|       true|      false|
+----+----+-----------+-----------+