BUG: `DataFrame.resample` changing index type to `MultiIndex` when dataframe is empty and upsampling#55772

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Charlie-XIAO wants to merge 11 commits intopandas-dev:mainfrom

Charlie-XIAO:empty-upsample-ind

Commits on Nov 11, 2023

Merge branch 'main' into empty-upsample-ind
Charlie-XIAO
authored

Commits on Dec 13, 2023

Commits on Dec 17, 2023

Commits on Jan 9, 2024

Merge remote-tracking branch 'upstream/main' into empty-upsample-ind
Charlie-XIAO
committed
Fix according to cleanup of fixtures and deprecation of resampling with PeriodIndex
Charlie-XIAO
committed