Minor: make it clear cache array reader is not cloning arrays #9057
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Which issue does this PR close?
Rationale for this change
I am tracking down allocations in various parts of the parquet reader (to remove them) and I ran across this in the cached reader.
What changes are included in this PR?
Use
Arc::cloneto make it clear there is no deep cloning going on . I don't expect this will have any impact on actual performanceAre these changes tested?
By CI
Are there any user-facing changes?