dirty hacking to recover 'L' support in python2

Author: zasdfgbnm

python/pyspark/sql/types.py

@@ -993,6 +993,14 @@ def _int_size_to_type(size):
 if sys.version_info[0] < 3:
     _array_type_mappings['c'] = StringType
 
+# SPARK-21465:
+# In python2, array of 'L' happened to be mistakenly partially supported. To
+# avoid breaking user's code, we should keep this partial support. Below is a
+# dirty hacking to keep this partial support and make the unit test passes
+if sys.version_info[0] < 3 and 'L' not in _array_type_mappings.keys():
+    _array_type_mappings['L'] = LongType
+    _array_unsigned_int_typecode_ctype_mappings['L'] = ctypes.c_uint
+
 
 def _infer_type(obj):
     """Infer the DataType from obj