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Backport PR #53231 on branch 2.0.x (PERF: fix merging on datetimelike columns to not use object-dtype factorizer) #53471

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Backport PR #53231: PERF: fix merging on datetimelike columns to not use object-dtype factorizer

@lumberbot-app lumberbot-app bot added this to the 2.0.3 milestone May 31, 2023
@lumberbot-app lumberbot-app bot added Datetime Datetime data dtype Performance Memory or execution speed performance Reshaping Concat, Merge/Join, Stack/Unstack, Explode labels May 31, 2023
@mroeschke mroeschke merged commit c1247a7 into pandas-dev:2.0.x Jun 1, 2023
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