[jira] [Created] (ARROW-462) [C++] Implement in-memory conversions between non-nested primitive types and DictionaryArray equivalent

["Wes McKinney (JIRA)" <ji...@apache.org>]

Wes McKinney created ARROW-462:
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             Summary: [C++] Implement in-memory conversions between non-nested primitive types and DictionaryArray equivalent
                 Key: ARROW-462
                 URL: https://issues.apache.org/jira/browse/ARROW-462
             Project: Apache Arrow
          Issue Type: New Feature
          Components: C++
            Reporter: Wes McKinney


We use a hash table to extract unique values and dictionary indices. There may be an opportunity to consolidate common code from the dictionary encoding implementation implemented in parquet-cpp (but the dictionary indices will not be run-length encoded in Arrow):

https://github.com/apache/parquet-cpp/blob/master/src/parquet/encodings/dictionary-encoding.h



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