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Heres, DanielAndy Grove
90f735c3bc1
Heres, Daniel authored and Andy Grove committed a3a619382f9
ARROW-11842: [Rust][Parquet] Use clone_from in get_batch_with_dict

This changes the code to use `slice::clone_from` (https://doc.rust-lang.org/std/clone/trait.Clone.html#method.clone_from) instead of `x = y.clone()` which saves some allocations.

This gives a small speed up when reading parquet files.

Closes #9619 from Dandandan/opt_parquet

Authored-by: Heres, Daniel <danielheres@gmail.com>
Signed-off-by: Andy Grove <andygrove@nvidia.com>