Is your feature request related to a problem or challenge?
For some group accumulators it would be necessary to check if the previous value was null explicitly. E.g. consider implementing GroupsAccumulator for FirstValue. One could explicitly store the null state of all groups but if we already use NullState it would make sense to reuse it for null checking as well.
Describe the solution you'd like
Add a public NullState::is_null method that takes and index and returns bool.
Describe alternatives you've considered
The alternative is to store a duplicate null state (e.g. as a NullBufferBuilder) in the groups accumulator but that is more wasteful.
Additional context
No response
Is your feature request related to a problem or challenge?
For some group accumulators it would be necessary to check if the previous value was
nullexplicitly. E.g. consider implementingGroupsAccumulatorforFirstValue. One could explicitly store thenullstate of all groups but if we already useNullStateit would make sense to reuse it for null checking as well.Describe the solution you'd like
Add a public
NullState::is_nullmethod that takes and index and returnsbool.Describe alternatives you've considered
The alternative is to store a duplicate null state (e.g. as a
NullBufferBuilder) in the groups accumulator but that is more wasteful.Additional context
No response