Need to check result of ScanRegions and BatchScanRegions
#1376
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Need to check result of
ref pingcap/tidb#54375
The failpoint mocks the split region which is not reported to PD yet, thus the returned result of scan regions can have some gaps inside it. The PD's API caller must check if the returned regions can fully cover the given range or ranges.
The batch load functions are used by tikv coprocessor since 8.2 and tiflash coprocessor in earlier versions, which affects the correctness.
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