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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.databricks.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.databricks.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|
+----+----+-----------+-----------+