isnull
An expression that returns true if the column is null. Supports Spark Connect.
For the corresponding Databricks SQL function, see isnull function.
Syntax
Python
from pyspark.sql import functions as dbf
dbf.isnull(col=<col>)
Parameters
Parameter | Type | Description |
|---|---|---|
|
| Target column to compute on. |
Returns
pyspark.sql.Column: True if value is null and False otherwise.
Examples
Python
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()
Output
+----+----+-----------+-----------+
| a| b|(a IS NULL)|(b IS NULL)|
+----+----+-----------+-----------+
| 1|NULL| false| true|
|NULL| 2| true| false|
+----+----+-----------+-----------+