Antoine Pitrou created ARROW-3997:
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             Summary: [C++] [Doc] Clarify dictionary encoding integer 
signedness (and width?)
                 Key: ARROW-3997
                 URL: https://issues.apache.org/jira/browse/ARROW-3997
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++, Documentation, Format
    Affects Versions: 0.11.1
            Reporter: Antoine Pitrou


The Arrow spec states that a dictionary-encoded array uses int32 indices. 
Signed or unsigned? The spec doesn't say.

Also, the C++ implementation supports all kinds of integers as indices (8- to 
64-bit, signed and unsigned). I wonder if we should at least mandate a specific 
signedness.



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