Simplify SortedDocIDMerger.next()#16073
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- Drop the `else if (queue.size() > 0)` guard in next(): the queue is guaranteed non-empty when that branch is reached, since an empty queue sets queueMinDocID to NO_MORE_DOCS and any valid nextDoc would have taken the fast path. Add a comment explaining the invariant. - Simplify reset() by handling the first sub before the loop, removing the `boolean first` flag and the dead `current = null` assignment.
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The
else if (queue.size() > 0)guard is always true when reached:an empty queue sets queueMinDocID to NO_MORE_DOCS, so any valid nextDoc
satisfies nextDoc < queueMinDocID and takes the fast path first. Replace
with
elseand add a comment explaining why the queue is never emptyat that point.