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Andy GroveKrisztián Szűcs
49455ec010b
Andy Grove authored and Krisztián Szűcs committed ec6436e6172
ARROW-12402: [Rust] [DataFusion] Implement SQL metrics example

This introduces a new method on `ExecutionPlan` to be able to access generic metrics from any physical operator.

One metric is implemented to demonstrate usage.

Closes #10049 from andygrove/ARROW-12402

Authored-by: Andy Grove <andygrove73@gmail.com>
Signed-off-by: Krisztián Szűcs <szucs.krisztian@gmail.com>