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  1. Apache Arrow
  2. ARROW-9550

[Rust] [DataFusion] Remove Rc<RefCell<_>> from hash aggregate operator

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      The hasg aggregate operator runs on a thread and therefore does not require Rc<RefCell<_>> usage and could just use mutable references instead.

      This does require some refactoring of the logic so that the code simply iterates over the rows, calling get_mut on the hashmap per row.

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              Unassigned Unassigned
              andygrove Andy Grove
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