Ok, I've studied the documentation.
First of all what I needed for most of my fields (StringField, TextField)
is the:
MultiFields.getTerms(reader, field.name).size();
which counts the distinct terms for the field.
For PointFields the hint was right: PointValues.size() is what i need.
For DocValues my question doesn't make sense, since there is no inverted
index for those fields.
Another edge case is the stored only field. Also for this one I think no
count could be provided by lucene.
Riccardo
2018-03-01 19:52 GMT+01:00 Riccardo Tasso :
> Thanks, probably for DocValues I can use DocValuesStatsCollector
> and DocValuesStats.
>
> 2018-03-01 2:13 GMT+01:00 Adrien Grand :
>
>> You probably want to look at PointValues.size(), which gives you the
>> number
>> of indexed points. Doc values do not support index statistics however.
>>
>> Le mer. 28 févr. 2018 à 21:47, Riccardo Tasso
>> a
>> écrit :
>>
>> > Hello,
>> > I'm porting an application from lucene 4 to lucene 7.
>> >
>> > I've converted a field from IntField to IntPoint and at query or
>> indexing
>> > time everything is ok.
>> >
>> > When I call the method:
>> >
>> > reader.getSumTotalTermFreq(field);
>> >
>> > it returns zero for my IntPoint field. I understand that IntPoint is
>> stored
>> > in specific data structure (the block k-d tree), but how could I obtain
>> the
>> > same result as in the previous version?
>> >
>> > Which is the best way to count the "number of terms" also for IntPoint?
>> >
>> > Can I also find the equivalent of "top terms", i.e. the list of more
>> > frequent values for a given field with their count?
>> >
>> > It would be the same if I will use the NumericDocValuesField?
>> >
>> > Thanks,
>> > Riccardo
>> >
>>
>
>
