WIP: [Parquet] Add tests for IO/CPU access in parquet reader #7971
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Which issue does this PR close?
Rationale for this change
There is quite a bit of cleverness in parquet reader related to IO patterns. To ensure we don't introduce regressions in the existing code, I would like to add tests that cover the IO patterns of the Parquet Reader.
I eventually would like to revisit the "minimize IO at all costs" design of the parquet reader (for use cases where the file is local, for example) but to do that I think we need to better understand what the current reader does
What changes are included in this PR?
Add a new test:
This is done for both the sync and async readers.
Are these changes tested?
This is only tests
Are there any user-facing changes?