pyspark.sql.functions.greatest

pyspark.sql.functions.greatest(*cols: ColumnOrName) → pyspark.sql.column.Column

Returns the greatest value of the list of column names, skipping null values. This function takes at least 2 parameters. It will return null if all parameters are null.

New in version 1.5.0.

Changed in version 3.4.0: Supports Spark Connect.

Parameters

colColumn or str

columns to check for gratest value.

Returns

Column

gratest value.

Examples

>>> df = spark.createDataFrame([(1, 4, 3)], ['a', 'b', 'c'])
>>> df.select(greatest(df.a, df.b, df.c).alias("greatest")).collect()
[Row(greatest=4)]

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