HaoYang670 commented on issue #1799:
URL: https://github.com/apache/arrow-rs/issues/1799#issuecomment-1147381920

   > Introduce a new ArrayDataLayout enumeration:
   ```rust
   pub enum ArrayDataLayout {
     Boolean { values: Buffer },
     Primitive{ values: Buffer },
     Offsets { offsets: Buffer, values: Buffer },
     Dictionary { keys: Buffer, values: ArrayData },
     List { offsets: Buffer, elements: ArrayData },
     Struct { children: Vec<ArrayData> },
     Union { offsets: Option<Buffer>, types: Buffer, children: Vec<ArrayData> },
   }
   ```
   I guess in this way, `Arrays` don't share the same layout anymore. 
Personally, I like it. Much clear than `ArrayData`.
   Curiously, why not directly declare each type of Array with `Buffers`, for 
example:
   ```rust
   Struct GenericBinaryArray {
       validatity: Option<Bitmap>,
       null_count: Option<usize>,
       offsets: Buffer,
       values: Buffer,
   }


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