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Note column names uniqueness constraint on join #256

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Merged
merged 2 commits into from
Sep 28, 2023
Merged

Note column names uniqueness constraint on join #256

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35ca598
note uniqueness constraint on join
MarcoGorelli Sep 7, 2023
bae1918
clarify raises
MarcoGorelli Sep 27, 2023
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10 changes: 10 additions & 0 deletions spec/API_specification/dataframe_api/dataframe_object.py
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Original file line number Diff line number Diff line change
Expand Up @@ -932,6 +932,10 @@ def join(
"""
Join with other dataframe.

Other than the joining column name(s), no column name is allowed to appear in
both `self` and `other`. Rename columns before calling `join` if necessary
using :meth:`rename_columns`.

Parameters
----------
other : DataFrame
Expand All @@ -951,4 +955,10 @@ def join(
Returns
-------
DataFrame

Raises
------
ValueError
If, apart from `left_on` and `right_on`, there are any column names
present in both `self` and `other`.
"""