LeafReader.get*Values is a low-level API whose return value depends on
what you indexed: if you did not add doc values to your documents then
it will return null. This is similar to Fields.terms which returns
null if you did not index a field.
On the other hand, DocValues.get* is higher-level and makes consuming
doc values easier. In that particular case, it just saves a null check
but there are more useful methods like DocValues.getSortedSet which
allow to treat fields which have been indexed with
DocValuesType.SORTED and DocValuesType.SORTED_SET the same way.
On Thu, Jul 9, 2015 at 1:04 PM, Varun Thacker
<varunthacker1...@gmail.com> wrote:
> Currently we have two APIs for getting DocValues for a field -
>
> 1. DocValues.getSorted(r, "bogus")
> 2. r.getSortedSetDocValues("bogus");
>
> Both the javadocs clearly state that 1 will return an empty set and 2 will
> return null if no values for the field are present in an segment.
>
> Was curious as to why do we have two different ways to fetch it and why do
> they have an different behaviour on no values for the field are present in
> an segment.
>
> --
>
>
> Regards,
> Varun Thacker
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