zero323 commented on a change in pull request #34226:
URL: https://github.com/apache/spark/pull/34226#discussion_r726587759
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File path: python/pyspark/sql/column.py
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@@ -50,7 +68,11 @@ def _to_java_column(col):
return jcol
-def _to_seq(sc, cols, converter=None):
+def _to_seq(
+ sc: SparkContext,
+ cols: Iterable["ColumnOrName"],
+ converter: Optional[Callable] = None,
Review comment:
We could have more specific type here (`Callable[[ColumnOrName],
JavaObject]`?), but it probably doesn't matter much
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