[Parquet] perf: preallocate capacity for ArrayReaderBuilder#9093

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lyang24 wants to merge 3 commits intoapache:mainfrom

lyang24:pre_allocate_view_vec

Commits on Jan 22, 2026

Minor: pre allocate view vec
lyang24
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Pass down batch_size from ArrowReaderBuilder through ArrayReaderBuilder.Ensure internal buffers to be pre-allocated.
lyang24
committed
made the value buffer optional and made the initialization on read to avoid allocate one extra buffer at the end
lyang24
committed