pyspark.sql.functions.collect_set¶
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pyspark.sql.functions.collect_set(col)[source]¶ Aggregate function: returns a set of objects with duplicate elements eliminated.
New in version 1.6.0.
Notes
The function is non-deterministic because the order of collected results depends on the order of the rows which may be non-deterministic after a shuffle.
Examples
>>> df2 = spark.createDataFrame([(2,), (5,), (5,)], ('age',)) >>> df2.agg(collect_set('age')).collect() [Row(collect_set(age)=[5, 2])]