perf: override default implementation in ArrayIter with dedicated null/non-nullable versions
#8697
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…ull/non-nullable versions implemented for: - `nth` / `nth_back` - `last` - `count` - `for_each` - `fold` / `rfold` - `all` - `any` - `find_map` - `find` / `rfind` - `partition` - `position` / `rposition`
rluvaton
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Oct 27, 2025
…from the iterator back this also adds a LOT of tests extracted from (which is how I found that bug): - apache#8697
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Which issue does this PR close?
N/A
Rationale for this change
Improve the performance of array iterator functions by skipping null checks on non nullable
What changes are included in this PR?
override
ArrayIterdefault function implementation with one that check if there are nulls or not:nth/nth_backlastcountfor_eachfold/rfoldallanyfind_mapfind/rfindpartitionposition/rpositionthis implement all functions in
Iterator/DoubleEndedIteratorthat the default implementation is either using some base function that we can't implement in stable (e.g.try_fold) or the implementation is naive (e.g. callingnext()a lot of times)Are these changes tested?
Yes, a LOT
Are there any user-facing changes?
Nope
This include the following fix which was found while working on this:
ArrayIterdoes not report size hint correctly after advancing from the iterator back #8728