8000 fix: correct read_csv behaviours with use_cols, names, index_col #1804
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sycai
reviewed
Jun 10, 2025
bigframes/session/loader.py
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| table_column_names = [field.name for field in table.schema] | ||
| for column_name in columns: | ||
| if column_name not in table_column_names: | ||
| possibility = min( | ||
| table_column_names, | ||
| key=lambda item: bigframes._tools.strings.levenshtein_distance( | ||
| column_name, item | ||
| ), | ||
| ) | ||
| raise ValueError( | ||
| f"Column '{column_name}' of `columns` not found in this table. " | ||
| f"Did you mean '{possibility}'?" | ||
| ) |
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nit: Shall we use a helper function/method? The indentation is very deep here. (https://goto.google.com/tott/733)
bigframes/session/loader.py
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| else: | ||
| if names is not None: |
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It feels like this is the same as elif names is not None: which can save you a level of indentation.
bigframes/session/loader.py
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| assert len(table.schema) >= len(list(names)) | ||
| assert len(list(names)) >= len(columns) | ||
| table_column_names = [ | ||
| field.name for field in table.schema[: len(list(names))] | ||
| ] | ||
|
|
||
| invalid_columns = set(columns) - set(names) | ||
| if len(invalid_columns) != 0: | ||
| raise ValueError( | ||
| "Usecols do not match columns, columns expected but not " | ||
| f"found: {invalid_columns}" | ||
| ) | ||
|
|
||
| rename_to_schema = dict(zip(list(names), table_column_names)) | ||
| names = columns | ||
| columns = [rename_to_schema[renamed_name] for renamed_name in columns] |
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The hosting function is very long. I think there might be an opportunity to make this code block a helper function/method
go/pystyle#function-length
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Refactored for more readable. Please check.
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sycai
previously approved these changes
Jun 11, 2025
sycai
approved these changes
Jun 11, 2025
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Fixes internal issue 421466334 🦕