MINOR: [C++] Remove TODO asking why null count set unknown #48823
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HyukjinKwon
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Rationale for this change
Removed a TODO from
replace_with_maskimplementation that asking why the replacements null count wasn't sufficient for a slice operation. When slicing an array, the null count from the original full array doesn't apply to the slice.The null count must be marked as
kUnknownNullCountand computed lazily when needed.What changes are included in this PR?
Replaced the TODO with some comments clarifying:
ArrayData::Slice())kUnknownNullCountis necessary (original null count doesn't apply to slice)Are these changes tested?
No, I did not test.
Are there any user-facing changes?
No.