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See the notice.md file distributed with this work for additional
information regarding copyright ownership.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
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Preconditions.checkNotNull(fileChannel, "fileChannel is null");
long size = fileChannel.size();
Preconditions.checkNotNull(comparator, "comparator is null");
Given a key, return an approximate byte offset in the file where
the data for that key begins (or would begin if the key were
present in the file). The returned value is in terms of file
bytes, and so includes effects like compression of the underlying data.
For example, the approximate offset of the last key in the table will
be close to the file length.