Tim-53 opened a new pull request, #9508:
URL: https://github.com/apache/arrow-rs/pull/9508
# Which issue does this PR close?
- Closes https://github.com/apache/arrow-rs/issues/9506
# Rationale for this change
`Vec::reserve(n)` does not guarantee exact capacity, Rust's
`MIN_NON_ZERO_CAP` optimization means `reserve(2)` gives capacity = 4 for most
numeric types, causing `debug_assert_eq!(capacity, batch_size)` to panic in
debug mode when `batch_size < 4`.
# What changes are included in this PR?
Replace `reserve` with `reserve_exact` in `ensure_capacity` in both
`InProgressPrimitiveArray` and `InProgressByteViewArray`. `reserve_exact` skips
the amortized growth optimization and allocates exactly the requested capacity,
making the assertion correct.
# Are these changes tested?
No. This only fixes an incorrect debug assertion.
# Are there any user-facing changes?
No
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