GH-39765: [C++][Dataset] Fix failures in dataset-scanner-benchmark #39794
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Rationale for this change
ScanOnlyBenchuse 2 kind of options to scan, but ignore the functionMakeScanNodewill return 4 extra columns.What changes are included in this PR?
Change the expected result of bench
ScanOnlyBenchAre these changes tested?
They covered by existing tests.