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PERF: use StringHashTable for value_counts / duplicated with strings #14860

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AlgosNon-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diff PerformanceMemory or execution speed performance StringsString extension data type and string data duplicatedduplicated, drop_duplicates
@jreback

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xref #14859

  • .value_counts()
  • .duplicated()

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AlgosNon-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diff PerformanceMemory or execution speed performance StringsString extension data type and string data duplicatedduplicated, drop_duplicates

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