itholic commented on code in PR #42994:
URL: https://github.com/apache/spark/pull/42994#discussion_r1331072003
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python/pyspark/pandas/groupby.py:
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@@ -1155,14 +1152,32 @@ def nth(self, n: int) -> FrameLike:
else:
sdf = sdf.select(*groupkey_names).distinct()
- internal = internal.copy(
+ agg_columns = []
+ if not self._agg_columns_selected:
Review Comment:
`groupkeys` is going to be a data column instead of index when it's not
included by `agg_columns_selected`. And index should be kept without updating
from Pandas 2.0.0 for `nth`. Therefore, we should include the `groupkeys` into
agg_columns to make it as a data column and create a new `InternalFrame`
manually.
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