[Rust] [Datafusion] Optionally load tpch data into memory before running benchmark query

[asfimport]

The tpch benchmark runtime seems to be dominated by csv parsing code and it is really difficult to see any performance hotspots related to actual query execution in a flamegraph.

With the date in memory and more iterations it should be easier to profile and find bottlenecks.

Reporter: Jörn Horstmann / @jhorstmann
Assignee: Jörn Horstmann / @jhorstmann

PRs and other links:

• GitHub Pull Request #8409

_{Note: This issue was originally created as ARROW-10240. Please see the migration documentation for further details.}

[asfimport]

Andy Grove / @andygrove:
Great idea @jhorstmann . Do you want me to take care of this or are you planning on working on it? I could do this tonight.

[asfimport]

Andy Grove / @andygrove:
On second thoughts, I might not be able to get to this right away.

[asfimport]

Jörn Horstmann / @jhorstmann:
Hi @andygrove, I was already working on this and should have assigned the ticket to me directly.

[asfimport]

Andy Grove / @andygrove:
Issue resolved by pull request 8409
#8409