yjshen commented on issue #2723:
URL: 
https://github.com/apache/arrow-datafusion/issues/2723#issuecomment-1157164945

   Note on `RowType::WordAligned`, which is used as the grouping state for hash 
aggregation:
   Since the varlena field would expand its width as new updates come in, 
fields after varlena should be moved accordingly to make them 
readable/updatable after a varlena update.
   
   We may consider an "out of place" store for these varlenas for 
`RowType::WordAligned`, to relieve the repeated need for moving/copying 
fixed-sized fields stored after valena fields. And put them in place when the 
update is finalized later.


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