[I] [Python] Allow `rename_columns` to take a mapping [arrow]

["judahrand (via GitHub)" <gi...@apache.org>]

judahrand opened a new issue, #40644:
URL: https://github.com/apache/arrow/issues/40644

   ### Describe the enhancement requested
   
   Pandas allows a mapping to be passed like `df.rename(columns={'foo': 'bar'})`. This is often very useful when you only want to rename a subset of the columns. Currently, `rename_columns` only accepts a list of all column names.
   
   I propose that `rename_columns` be extended to accept a `Mapping[str, str]`. All columns with a name matching a key of the mapping will be renamed to the relevant value. If any key does not correspond to at least one column then a `KeyError` should be raised.
   
   Example:
   ```python
   >>> import pyarrow as pa
   >>> import pandas as pd
   >>> df = pd.DataFrame({'n_legs': [2, 4, 5, 100],
   ...                    'animals': ["Flamingo", "Horse", "Brittle stars", "Centipede"]})
   >>> batch = pa.RecordBatch.from_pandas(df)
   >>> new_names = {"n_legs": "n", "animals": "name"}
   >>> batch.rename_columns(new_names)
   pyarrow.RecordBatch
    n: int64
    name: string
    ----
    n: [2,4,5,100]
    name: ["Flamingo","Horse","Brittle stars","Centipede"]
   ```
   
   ### Component(s)
   
   Python


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Re: [I] [Python] Allow `rename_columns` to take a mapping [arrow]

["AlenkaF (via GitHub)" <gi...@apache.org>]

AlenkaF commented on issue #40644:
URL: https://github.com/apache/arrow/issues/40644#issuecomment-2056518207

   Issue resolved by pull request 40645
   https://github.com/apache/arrow/pull/40645


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Re: [I] [Python] Allow `rename_columns` to take a mapping [arrow]

["AlenkaF (via GitHub)" <gi...@apache.org>]

AlenkaF closed issue #40644: [Python] Allow `rename_columns` to take a mapping
URL: https://github.com/apache/arrow/issues/40644


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