txnsnapshot: provide oneByOneIter to combine multiple iterator together #283
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Signed-off-by: Chao Wang <cclcwangchao@hotmail.com>
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It should moved to tidb if it is currently only used by temporary table |
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Signed-off-by: Chao Wang cclcwangchao@hotmail.com
Refer: pingcap/tidb#26952
For scanning multiple retrievers, provide oneByOneIter to combine multiple iterator together