Got it,  thank you very much.
在 2013-7-29 下午11:34,"Adrien Grand" <jpou...@gmail.com>写道:

> Hi,
>
> On Mon, Jul 29, 2013 at 4:56 PM, Yonghui Zhao <zhaoyong...@gmail.com>
> wrote:
> > I want to know what will be returned if  the input docID is not a valid
> id,
> > for examples:
> >
> > 1. the docID beyonds the reader scope
>
> In that case, the behavior is not defined, it might throw an exception
> or return a random value. You should make sure you always call this
> method with a valid document ID.
>
> > 2. the doc with this docID is already deleted
>
> It will return the same value it returned prior to the document
> deletion. However, you shouldn't rely on this.
>
> > 2. the doc with this docID doesn't has the field
>
> In that case, the behavior is defined: it will return 0.
>
> Numeric doc values expect are dense: all documents have a value. When
> a document doesn't have a value, 0 will be assigned by default at
> indexing time.
>
> --
> Adrien
>
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