Github user yongtang commented on a diff in the pull request:
https://github.com/apache/spark/pull/17328#discussion_r122748372
--- Diff: python/pyspark/sql/functions.py ---
@@ -1854,6 +1854,46 @@ def sort_array(col, asc=True):
return Column(sc._jvm.functions.sort_array(_to_java_column(col), asc))
+@since(2.2)
+def map_keys(col):
+ """
+ Collection function: Returns an unordered array containing the keys of
the map.
+
+ :param col: name of column or expression
+
+ >>> from pyspark.sql.functions import map_keys
+ >>> df = spark.sql("SELECT map(1, 'a', 2, 'b') as data")
+ >>> df.select(map_keys("data").alias("keys")).show()
+ +------+
+ | keys|
+ +------+
+ |[1, 2]|
+ +------+
+ """
+ sc = SparkContext._active_spark_context
+ return Column(sc._jvm.functions.map_keys(_to_java_column(col)))
+
+
+@since(2.2)
--- End diff --
Done.
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