danking opened a new issue, #7571:
URL: https://github.com/apache/arrow-rs/issues/7571
**Describe the bug**
```
new_null_array(
&DataType::Struct(Fields::from(vec![Field::new(
"non_nullable_deeper_inner",
DataType::Dictionary(Box::new(DataType::Utf8),
Box::new(DataType::Int32)),
false,
)])),
1,
);
```
```
called `Option::unwrap()` on a `None` value
stack backtrace:
0: rust_begin_unwind
at
/rustc/f8a913b1381e90379c7ca63ac2b88b9518936628/library/std/src/panicking.rs:695:5
1: core::panicking::panic_fmt
at
/rustc/f8a913b1381e90379c7ca63ac2b88b9518936628/library/core/src/panicking.rs:75:14
2: core::panicking::panic
at
/rustc/f8a913b1381e90379c7ca63ac2b88b9518936628/library/core/src/panicking.rs:145:5
3: core::option::unwrap_failed
at
/rustc/f8a913b1381e90379c7ca63ac2b88b9518936628/library/core/src/option.rs:2015:5
4: core::option::Option<T>::unwrap
at
/Users/danielking/.rustup/toolchains/nightly-2025-02-24-aarch64-apple-darwin/lib/rustlib/src/rust/library/core/src/option.rs:978:21
5: arrow_data::data::ArrayData::new_null
at
/Users/danielking/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/arrow-data-55.0.0/src/data.rs:633:33
6: arrow_data::data::ArrayData::new_null::{{closure}}
at
/Users/danielking/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/arrow-data-55.0.0/src/data.rs:628:34
7: core::iter::adapters::map::map_fold::{{closure}}
at
/Users/danielking/.rustup/toolchains/nightly-2025-02-24-aarch64-apple-darwin/lib/rustlib/src/rust/library/core/src/iter/adapters/map.rs:88:28
8: <core::slice::iter::Iter<T> as
core::iter::traits::iterator::Iterator>::fold
at
/Users/danielking/.rustup/toolchains/nightly-2025-02-24-aarch64-apple-darwin/lib/rustlib/src/rust/library/core/src/slice/iter/macros.rs:255:27
9: <core::iter::adapters::map::Map<I,F> as
core::iter::traits::iterator::Iterator>::fold
at
/Users/danielking/.rustup/toolchains/nightly-2025-02-24-aarch64-apple-darwin/lib/rustlib/src/rust/library/core/src/iter/adapters/map.rs:128:9
10: core::iter::traits::iterator::Iterator::for_each
at
/Users/danielking/.rustup/toolchains/nightly-2025-02-24-aarch64-apple-darwin/lib/rustlib/src/rust/library/core/src/iter/traits/iterator.rs:800:9
11: alloc::vec::Vec<T,A>::extend_trusted
at
/Users/danielking/.rustup/toolchains/nightly-2025-02-24-aarch64-apple-darwin/lib/rustlib/src/rust/library/alloc/src/vec/mod.rs:3565:17
12: <alloc::vec::Vec<T,A> as
alloc::vec::spec_extend::SpecExtend<T,I>>::spec_extend
at
/Users/danielking/.rustup/toolchains/nightly-2025-02-24-aarch64-apple-darwin/lib/rustlib/src/rust/library/alloc/src/vec/spec_extend.rs:29:9
13: <alloc::vec::Vec<T> as
alloc::vec::spec_from_iter_nested::SpecFromIterNested<T,I>>::from_iter
at
/Users/danielking/.rustup/toolchains/nightly-2025-02-24-aarch64-apple-darwin/lib/rustlib/src/rust/library/alloc/src/vec/spec_from_iter_nested.rs:62:9
14: <alloc::vec::Vec<T> as
alloc::vec::spec_from_iter::SpecFromIter<T,I>>::from_iter
at
/Users/danielking/.rustup/toolchains/nightly-2025-02-24-aarch64-apple-darwin/lib/rustlib/src/rust/library/alloc/src/vec/spec_from_iter.rs:34:9
15: <alloc::vec::Vec<T> as
core::iter::traits::collect::FromIterator<T>>::from_iter
at
/Users/danielking/.rustup/toolchains/nightly-2025-02-24-aarch64-apple-darwin/lib/rustlib/src/rust/library/alloc/src/vec/mod.rs:3424:9
16: core::iter::traits::iterator::Iterator::collect
at
/Users/danielking/.rustup/toolchains/nightly-2025-02-24-aarch64-apple-darwin/lib/rustlib/src/rust/library/core/src/iter/traits/iterator.rs:1971:9
17: arrow_data::data::ArrayData::new_null
at
/Users/danielking/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/arrow-data-55.0.0/src/data.rs:626:21
18: arrow_array::array::new_null_array
at
/Users/danielking/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/arrow-array-55.0.0/src/array/mod.rs:867:16
```
**To Reproduce**
see above.
**Expected behavior**
<!--
A clear and concise description of what you expected to happen.
-->
**Additional context**
<!--
Add any other context about the problem here.
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