[jira] [Created] (ARROW-5343) [C++] Consider using Buffer for transpose maps in DictionaryType::Unify instead of std::vector

Wed, 15 May 2019 15:07:48 -0700 

Wes McKinney created ARROW-5343:
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             Summary: [C++] Consider using Buffer for transpose maps in 
DictionaryType::Unify instead of std::vector
                 Key: ARROW-5343
                 URL: https://issues.apache.org/jira/browse/ARROW-5343
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Wes McKinney


In the spirit of "track all the allocations", if dictionaries have non-trivial 
length, we may want to account for this memory more precisely. 



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