Github user viirya commented on the issue: https://github.com/apache/spark/pull/18277 When you try to do this on a rdd of array of unicode string. The result of Python2 looks a bit weird. Using Python version 2.7.12 (default, Jul 1 2016 15:12:24) SparkSession available as 'spark'. >>> data = [u'\u6d4b\u8bd5', '1'] >>> rdd = sc.parallelize(data) >>> result = rdd.pipe('cat').collect() >>> result [u'\u6d4b\u8bd5', u'1'] >>> data = [[u'\u6d4b\u8bd5', '1'], ['1', '2']] >>> rdd = sc.parallelize(data) >>> rdd.collect() [[u'\u6d4b\u8bd5', '1'], ['1', '2']] >>> result = rdd.pipe('cat').collect() >>> result [u"[u'\\u6d4b\\u8bd5', '1']", u"['1', '2']"] # looks weird and different to Python3. >>> Using Python version 3.5.2 (default, Nov 17 2016 17:05:23) SparkSession available as 'spark'. >>> data = [u'\u6d4b\u8bd5', '1'] >>> rdd = sc.parallelize(data) >>> result = rdd.pipe('cat').collect() >>> result ['\u6d4b\u8bd5', '1'] >>> data = [[u'\u6d4b\u8bd5', '1'], ['1', '2']] >>> rdd = sc.parallelize(data) >>> rdd.collect() [['\u6d4b\u8bd5', '1'], ['1', '2']] >>> result = rdd.pipe('cat').collect() >>> result ["['\u6d4b\u8bd5', '1']", "['1', '2']"] >>>
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