Github user ueshin commented on a diff in the pull request: https://github.com/apache/spark/pull/21011#discussion_r182333814 --- Diff: python/pyspark/sql/functions.py --- @@ -1846,6 +1846,27 @@ def array_contains(col, value): return Column(sc._jvm.functions.array_contains(_to_java_column(col), value)) +@ignore_unicode_prefix +@since(2.4) +def array_join(col, delimiter, null_replacement=None): + """ + Concatenates the elements of `column` using the `delimiter`. Null values are replaced with + `nullReplacement` if set, otherwise they are ignored. --- End diff -- nit: `null_replacement`?
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