mapleFU commented on issue #43716:
URL: https://github.com/apache/arrow/issues/43716#issuecomment-2314456266

   I've read the related code in Velox[1] and arrow-rs[2], they use similiar 
encoding here.
   
   List:
   
   ```
   [null-flag][element-count] [ element +]
   ```
   
   Element list is stored together or in variable-length area.
   
   Struct:
   
   ```
   [null-flag][elements]
   ```
   
   I'd like to:
   1. Finish https://github.com/apache/arrow/issues/43758 firstly
   2. Support (non-nested) List in RowEncoder
   3. Support in HashJoin / SwissJoin
   
   In the future more types ( included nested ) can be supports
   
   cc @pitrou @zanmato1984 
   
   [1] 
https://github.com/facebookincubator/velox/blob/db8875c425e8132f553adf12e106cd2e28a811c0/velox/exec/ContainerRowSerde.cpp
   [2] https://github.com/apache/arrow-rs/blob/master/arrow-row/src/lib.rs#L147


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