When we access a row from a table or a struct, we create a proxy for the struct. We could improve the performance of these accesses by creating a single instance of the proxy and store it on the vector or the data type and then reuse that instance.

This should improve performance.

See

Reporter: Dominik Moritz / @domoritz

_{Note: This issue was originally created as ARROW-15379. Please see the migration documentation for further details.}