Change Keys method in kv interface to Scan #1558
Merged
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Keys was a placeholder, as an external keyvalue may have more keys than we want to read at once. Additionally we don't want to overload the external store with an operation that will block for a long time. Now the Scan interface will only get some number of keys at a time. Implementations for Redis and TiKV have been added.
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PR Checklist
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flag togit commit
.make generate
has been runcollectsub
protobuf has been changed,make proto
has been run