Add the LooseIndexScanBatchingStrategy strategy
What does this MR do and why?
This PR adds the LooseIndexScanBatchingStrategy
batched BG migration strategy which helps batching over non-distinct column values.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Edited by Adam Hegyi