[GitHub] [arrow-rs] HaoYang670 commented on issue #1642: MapArray Requires Values Array

[GitBox <gi...@apache.org>]

HaoYang670 commented on issue #1642:
URL: https://github.com/apache/arrow-rs/issues/1642#issuecomment-1116731396

   > I'm not actually entirely sure, the arrow specification doesn't seem to describe the semantics of Map Arrays
   
   `MapArray` seems like a logic type of `ListArray` whose child is a `StructArray`.
   ```rust
   /// [MapArray] is physically a [crate::array::ListArray] that has a
   /// [crate::array::StructArray] with 2 child fields.
   pub struct MapArray {
       data: ArrayData,
       values: ArrayRef,
       value_offsets: RawPtrBox<i32>,
   }
   ```


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