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PERF: MultiIndex.copy(deep=False) not preserving _id #47878

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Closed
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jbrockmendel opened this issue Jul 27, 2022 · 0 comments · Fixed by #47900
Closed
3 tasks done

PERF: MultiIndex.copy(deep=False) not preserving _id #47878

jbrockmendel opened this issue Jul 27, 2022 · 0 comments · Fixed by #47900
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MultiIndex Performance Memory or execution speed performance

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@jbrockmendel
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Pandas version checks

  • I have checked that this issue has not already been reported.

  • I have confirmed this bug exists on the latest version of pandas.

  • I have confirmed this bug exists on the main branch of pandas.

Reproducible Example

NA

Issue Description

I think this is causing a perf issue in a .agg call that results in a concat call with a single-element list.

Expected Behavior

NA

Installed Versions

Replace this line with the output of pd.show_versions()
@jbrockmendel jbrockmendel added Bug Needs Triage Issue that has not been reviewed by a pandas team member labels Jul 27, 2022
@mroeschke mroeschke added Performance Memory or execution speed performance MultiIndex and removed Bug Needs Triage Issue that has not been reviewed by a pandas team member labels Jul 27, 2022
@jbrockmendel jbrockmendel mentioned this issue Jul 29, 2022
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BUG: preserve _id in MultiIndex.copy(deep=False) jbrockmendel/pandas
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@jbrockmendel @mroeschke