pyspark.sql.functions.isnull#
- pyspark.sql.functions.isnull(col)[source]#
An expression that returns true if the column is null.
New in version 1.6.0.
Changed in version 3.4.0: Supports Spark Connect.
- Parameters
- col
Column
or str target column to compute on.
- col
- Returns
Column
True if value is null and False otherwise.
Examples
>>> df = spark.createDataFrame([(1, None), (None, 2)], ("a", "b")) >>> df.select("a", "b", isnull("a").alias("r1"), isnull(df.b).alias("r2")).show() +----+----+-----+-----+ | a| b| r1| r2| +----+----+-----+-----+ | 1|NULL|false| true| |NULL| 2| true|false| +----+----+-----+-----+