alamb commented on issue #10776:
URL: https://github.com/apache/arrow-rs/issues/10776#issuecomment-5370325229
Another example where it might be better to incrementally build the output
```rust
// Pad the tail so the filters cover `expected_rows` total. This
keeps
// the invariant that the resulting `RowSelection` spans every row
the
// reader would have produced — rows past the early break are marked
// "not selected". When no limit is set the loop always exhausts and
// no padding is needed.
if let Some(expected) = expected_rows
&& processed_rows < expected
{
let pad_len = expected - processed_rows;
filters.push(BooleanArray::new(BooleanBuffer::new_unset(pad_len), None));
}
```
(it allocates a new array)
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