Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/19319#discussion_r140482349
--- Diff: python/pyspark/sql/dataframe.py ---
@@ -37,6 +37,7 @@
from pyspark.sql.column import Column, _to_seq, _to_list, _to_java_column
from pyspark.sql.readwriter import DataFrameWriter
from pyspark.sql.streaming import DataStreamWriter
+from pyspark.sql.types import IntegralType
from pyspark.sql.types import *
--- End diff --
Looks we don't need to import `IntegralType`.
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