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Backport PR #47762: REGR: preserve reindexed array object (instead of creating new array) for concat with all-NA array

…instead of creating new array) for concat with all-NA array
@lumberbot-app lumberbot-app bot added this to the 1.4.4 milestone Aug 30, 2022
@lumberbot-app lumberbot-app bot added ExtensionArray Extending pandas with custom dtypes or arrays. Regression Functionality that used to work in a prior pandas version Reshaping Concat, Merge/Join, Stack/Unstack, Explode labels Aug 30, 2022
@simonjayhawkins simonjayhawkins merged commit bc82815 into pandas-dev:1.4.x Aug 30, 2022
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ExtensionArray Extending pandas with custom dtypes or arrays. Regression Functionality that used to work in a prior pandas version Reshaping Concat, Merge/Join, Stack/Unstack, Explode

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