BUG: Fix pyarrow categoricals not working for pivot and multiindex #61193
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…pyarrow dictionary categoricals Relates to pandas-dev#53051 Code for fix taken and adapted from pandas-dev#59099
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DataFrame.pivotfails withpyarrowbackend if variable is already encoded asdictionary#53051doc/source/whatsnew/vX.X.X.rstfile if fixing a bug or adding a new feature.Disclaimer
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