HyukjinKwon commented on a change in pull request #34389:
URL: https://github.com/apache/spark/pull/34389#discussion_r737068431
##########
File path: python/pyspark/pandas/namespace.py
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@@ -413,6 +414,10 @@ def read_csv(
(label, col) for label, col in column_labels.items() if label not
in index_col
)
else:
+ log_advice(
+ "If `index_col` is not specified for `read_csv`, "
+ "the default index is attached which is expensive."
Review comment:
`which is expensive` -> `which can cause additional overhead`
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