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  1. Apache Arrow
  2. ARROW-6473

[Format] Clarify dictionary encoding edge cases

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      Several recent threads on the mailing list:

      1.  Edge case for all null columns and interleaved dictionaries

      2. Semantics non-delta dictionaries (and relation to the file format).

      3.  Propose a forward compatible enum so dictionaries can represented as other types besides for a "flat" vector.

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              emkornfield@gmail.com Micah Kornfield
              emkornfield@gmail.com Micah Kornfield
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