Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/21477#discussion_r193260315
--- Diff: python/pyspark/sql/streaming.py ---
@@ -30,6 +30,7 @@
from pyspark.sql.readwriter import OptionUtils, to_str
from pyspark.sql.types import *
from pyspark.sql.utils import StreamingQueryException
+from abc import ABCMeta, abstractmethod
--- End diff --
done.
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