Backport of clarify when shard iterators get sorted #52810
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Currently we have two ways to create a GroupShardsIterator: one that will resort the iterators based on their natural ordering, and another one that will leave them in their original order. This is currently done through two constructors, one that accepts a single argument which does the sorting, and another which accepts a second boolean argument to control whether sorting should happen or not. This second constructor is only called externally to disable the sorting. By introducing a specific method to create a sorted shard iterator we clarify and make it easier to track when we do sort and when we do not as the iterators are externally sorted.
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Backport of #52633
Currently we have two ways to create a GroupShardsIterator: one that will resort the iterators based on their natural ordering, and another one that will leave them in their original order. This is currently done through two constructors, one that accepts a single argument which does the sorting, and another which accepts a second boolean argument to control whether sorting should happen or not. This second constructor is only called externally to disable the sorting.
By introducing a specific method to create a sorted shard iterator we clarify and make it easier to track when we do sort and when we do not as the iterators are externally sorted.