Skip to content

REF: GH38174 - Refactoring DataFrame.combine_first #47417

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Closed
wants to merge 3 commits into from
Closed

REF: GH38174 - Refactoring DataFrame.combine_first #47417

Changes from all commits
Commits
Show all changes
3 commits
Select commit Hold shift + click to select a range
85ba22e
REF: GH38174 - Refactoring DataFrame.combine_first to use BlockManage…
hydratedguy Jun 19, 2022
99aad10
_mgr.where axis=1 and some code cleaning
hydratedguy Jun 19, 2022
44d8c6b
removing axis=1
hydratedguy Jun 21, 2022
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
6 changes: 3 additions & 3 deletions pandas/core/frame.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -7822,20 +7822,20 @@ def combine_first(self, other: DataFrame) -> DataFrame:
1 0.0 3.0 1.0
2 NaN 3.0 1.0
"""
import pandas.core.computation.expressions as expressions

def combiner(x, y):
mask = extract_array(isna(x))

x_values = extract_array(x, extract_numpy=True)
y_values = extract_array(y, extract_numpy=True)

# If the column y in other DataFrame is not in first DataFrame,
# just return y_values.
if y.name not in self.columns:
return y_values

return expressions.where(mask, y_values, x_values)
values = self._mgr.where(y_values, mask, align=True)

return self._constructor(data=values)

combined = self.combine(other, combiner, overwrite=False)

Expand Down