region cache: retry scan or batch scan regions when returned region has no leader #1480
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Signed-off-by: cfzjywxk <cfzjywxk@gmail.com>
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Signed-off-by: cfzjywxk <cfzjywxk@gmail.com>
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Ref: pingcap/tidb#56757
When there is no leader information for all the returned regions, retry scan or batch scan region from PD but not return errors to the upper layer.