Weijun-H opened a new issue, #10341:
URL: https://github.com/apache/arrow-rs/issues/10341
Some downstream consumers need to account for memory retained by Arrow array
builders while rows are still being appended. Existing builder slice accessors
expose initialized data, but not the underlying allocated capacity retained by
values, offsets, or validity buffers.
For memory accounting, using initialized lengths can undercount allocation
slack after buffer growth. Exposing read-only capacity accessors for the
existing builder buffers would let downstream code measure retained builder
capacity without changing append, reserve, finish, or resize behavior.
The proposed API surface is limited to read-only accessors on existing
builders:
- `GenericByteBuilder::{values_capacity, offsets_capacity,
validity_capacity}`
- `GenericListBuilder::{offsets_capacity, validity_capacity}`
- `PrimitiveBuilder::validity_capacity`
- `StructBuilder::validity_capacity`
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