db: add initMergingIterLevel to flushable interface #3616
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Add a new initMergingIterLevel method to the flushable interface for setting up a flushable's level within the mergingIter. This is used to update ingested flushables to use a levelIter to surface range deletions, like other levels of the LSM do. This is more efficient, avoiding unnecessarily loading range deletions in other files, and consistent.
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Add a new initMergingIterLevel method to the flushable interface for setting up a flushable's level within the mergingIter. This is used to update ingested flushables to use a levelIter to surface range deletions, like other levels of the LSM do. This is more efficient, avoiding unnecessarily loading range deletions in other files, and consistent.