HyukjinKwon commented on a change in pull request #33450:
URL: https://github.com/apache/spark/pull/33450#discussion_r673897345
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File path: python/pyspark/pandas/sql_processor.py
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@@ -65,6 +66,9 @@ def sql(
----------
query : str
the SQL query
+ index_col : str or list of str, optional
Review comment:
I mean I don't know the standard way of describing the list of strings
(`list of str`). Are you able to find any example like this in pandas or NumPy
documentation?
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