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  1. Apache Arrow
  2. ARROW-843

[C++] Implement Schema unification, merging unequal but equivalent schemas

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      Some Parquet datasets may contain schemas with mixed REQUIRED/OPTIONAL repetition types. While such schemas aren't strictly equal, we will need to consider them equivalent on the read path

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              fsaintjacques Francois Saint-Jacques
              wesm Wes McKinney
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