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  1. Apache Arrow
  2. ARROW-7069

[C++][Dataset] Replace ConstantPartitionScheme with PrefixDictionaryPartitionScheme

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      ConstantPartitionScheme is not very useful, it'd be better to provide a dictionary of prefixes which maps to provided partition expressions

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            bkietz Ben Kietzman Assign to me
            bkietz Ben Kietzman
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