Add sort parameter to concat. #1636
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This is based on #1627. Please review it first. |
ueshin
changed the title
HyukjinKwon
reviewed
Jul 9, 2020
| @@ -1834,9 +1843,11 @@ def resolve_func(kdf, this_column_labels, that_column_labels): | |||
| # DataFrame, Series ... & Series, Series ... | |||
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Maybe we should throw an exception when axis=1 and sort is set:
>>> import pandas as pd
>>> pd.concat([pd.DataFrame({'b': [4, 5, 6]}, index=[4,3,2]), pd.DataFrame({'a': [3, 4, 5]}, index=[4,3,2])], sort=False, axis=1)
b a
4 4 3
3 5 4
2 6 5
>>> pd.concat([pd.DataFrame({'b': [4, 5, 6]}, index=[4,3,2]), pd.DataFrame({'a': [3, 4, 5]}, index=[4,3,2])], sort=True, axis=1)
b a
2 6 5
3 5 4
4 4 3There was a problem hiding this comment.
Anyway pandas' behavior is not deterministic, at least seems so..
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😭 .. any way is fine. We could just sort_index() or just throw an exception
HyukjinKwon
reviewed
Jul 9, 2020
databricks/koalas/namespace.py
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| merged_columns = sorted( | ||
| list(set(itertools.chain.from_iterable(column_labelses_of_kdfs))) | ||
| ) | ||
| merged_columns = column_labels_of_kdfs[0].copy() |
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no big deal since it's already guarded above but we could add an assert for the length of column_labels_of_kdfs to be non-empty.
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We could also add an assert on merged_columns too.
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Thanks! merging. |
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Adding
sortparameter toks.concat().