Minor: add documentation note about NullState
#12791
Merged
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Which issue does this PR close?
Closes #.
Rationale for this change
While working on #6906 with @devanbenz it was not always clear that much of the complexity related to null handling in
GroupsAccumulator
can be handled byNullState
What changes are included in this PR?
GroupsAccumulator
commentsAre these changes tested?
Yes, by CI
Are there any user-facing changes?
Just documentation