Fix memory size accounting for grouped median and avg#23357
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Which issue does this PR close?
Rationale for this change
AvgGroupsAccumulatorstores sums inVec<T::Native>, andMedianGroupsAccumulatorstores grouped values inVec<Vec<T::Native>>, but theirsize()implementations usedsize_of::<T>()when accounting for those allocations.This underreports memory usage for those grouped aggregate buffers.
What changes are included in this PR?
size_of::<T::Native>()for groupedavgsum storage.size_of::<T::Native>()for groupedmedianvalue storage.Are these changes tested?
Existing aggregate tests pass.
Are there any user-facing changes?
No. This only affects internal memory accounting.