srowen commented on issue #23954: [SPARK-27041][PySpark] Use imap() for python 2.x to resolve oom issue URL: https://github.com/apache/spark/pull/23954#issuecomment-471380049 @TigerYang414 see https://github.com/apache/spark/pull/23954#discussion_r263470130 ; maybe a short test that defines a UDF that checks what `map` is? in `pyspark/sql/tests/test_functions.py`
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