Index is being materialized in pd.concat
when axis=1
#46675
Labels
Index
Related to the Index class or subclasses
Performance
Memory or execution speed performance
Regression
Functionality that used to work in a prior pandas version
Reshaping
Concat, Merge/Join, Stack/Unstack, Explode
Milestone
Pandas version checks
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I have confirmed this issue exists on the latest version of pandas.
I have confirmed this issue exists on the main branch of pandas.
Reproducible Example
Installed Versions
Prior Performance
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