viirya commented on issue #1694:
URL: https://github.com/apache/arrow-rs/issues/1694#issuecomment-1137993074

   The `dict_id` is at `Field`.  For `Map`, it has a `Field` which is a 
`Struct` field which has two fields for key and value. The dict id should be 
set at the nested field for the key.


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