srowen commented on a change in pull request #23954: [SPARK-27041][PySpark] Use
imap() for python 2.x to resolve oom issue
URL: https://github.com/apache/spark/pull/23954#discussion_r263470130
##########
File path: python/pyspark/worker.py
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@@ -45,6 +45,8 @@
if sys.version >= '3':
basestring = str
+else:
+ from itertools import imap as map # use iterator map by default
Review comment:
How can we test it here -- make a UDF that checks the value of
`map.__module__`? if it's `itertools`, then fail, as it would mean this import
'leaked' into the UDF right? Otherwise in Python 2/3 it should return
`builtins` or `__builtin__`
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