index: DocIDReader.Next() returns nil when done not io.EOF
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@ -175,7 +175,7 @@ type FieldDict interface {
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// Close the reader to release associated resources.
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type DocIDReader interface {
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// Next returns the next document internal identifier in the natural
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// index order, or io.EOF when the end of the sequence is reached.
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// index order, nil when the end of the sequence is reached.
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Next() (IndexInternalID, error)
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// Advance resets the iteration to the first internal identifier greater than
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