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3 changes: 3 additions & 0 deletions python/pyspark/sql/functions.py
Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,9 @@
if sys.version < "3":
from itertools import imap as map

if sys.version >= '3':
basestring = str

from pyspark import since, SparkContext
from pyspark.rdd import ignore_unicode_prefix, PythonEvalType
from pyspark.sql.column import Column, _to_java_column, _to_seq, _create_column_from_literal
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