At the the moment we hold the whole index in main memory. But the index can potentially exceed our RAM limit. Therefore we need a seeklist (which maps from letter to position in index.txt) to only load those parts of the index that we actually need to answer the respective query.
At the the moment we hold the whole index in main memory. But the index can potentially exceed our RAM limit. Therefore we need a seeklist (which maps from letter to position in index.txt) to only load those parts of the index that we actually need to answer the respective query.