jorgecarleitao opened a new issue #806:
URL: https://github.com/apache/arrow-rs/issues/806
Equivalent to #773 for the `MapArray`.
```rust
use std::convert::TryFrom;
use std::sync::Arc;
use arrow::array::*;
use arrow::buffer::*;
use arrow::datatypes::*;
fn main() {
let data = ArrayData::new(
DataType::Map(
Box::new(Field::new(
"entries",
DataType::Struct(vec![
Field::new("keys", DataType::Utf8, false),
Field::new("values", DataType::Utf8, false),
]),
false,
)),
false,
),
10,
None,
None,
0,
vec![Buffer::from_slice_ref(&[0i32, 10])],
vec![StructArray::try_from(vec![
(
"keys",
Arc::new(StringArray::from(vec!["hello", "", "parquet"])) as
ArrayRef,
),
(
"values",
Arc::new(StringArray::from(vec!["hello", "", "parquet"])) as
ArrayRef,
),
])
.unwrap()
.data_ref()
.clone()],
);
let a = MapArray::from(data);
let b = a.value(1);
let b = b.as_any().downcast_ref::<StructArray>().unwrap();
println!("{:?}", b);
}
```
error: Undefined Behavior: using uninitialized data, but this operation
requires initialized memory
--> /home/azureuser/projects/arrow-rs/arrow/src/array/array_map.rs:73:19
|
73 | let end = self.value_offsets()[i + 1] as usize;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ using
uninitialized data, but this operation requires initialized memory
|
= help: this indicates a bug in the program: it performed an invalid
operation, and caused Undefined Behavior
= help: see
https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html
for further information
= note: inside `arrow::array::MapArray::value` at
/home/azureuser/projects/arrow-rs/arrow/src/array/array_map.rs:73:19
note: inside `main` at arrow/examples/unsafe.rs:41:13
--> arrow/examples/unsafe.rs:41:13
|
41 | let b = a.value(1);
| ^^^^^^^^^^
= note: inside `<fn() as std::ops::FnOnce<()>>::call_once - shim(fn())`
at
/home/azureuser/.rustup/toolchains/nightly-2021-07-09-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ops/function.rs:227:5
= note: inside
`std::sys_common::backtrace::__rust_begin_short_backtrace::<fn(), ()>` at
/home/azureuser/.rustup/toolchains/nightly-2021-07-09-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/sys_common/backtrace.rs:125:18
= note: inside closure at
/home/azureuser/.rustup/toolchains/nightly-2021-07-09-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/rt.rs:63:18
= note: inside `std::ops::function::impls::<impl std::ops::FnOnce<()> for
&dyn std::ops::Fn() -> i32 + std::marker::Sync +
std::panic::RefUnwindSafe>::call_once` at
/home/azureuser/.rustup/toolchains/nightly-2021-07-09-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ops/function.rs:259:13
= note: inside `std::panicking::r#try::do_call::<&dyn std::ops::Fn() ->
i32 + std::marker::Sync + std::panic::RefUnwindSafe, i32>` at
/home/azureuser/.rustup/toolchains/nightly-2021-07-09-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panicking.rs:401:40
= note: inside `std::panicking::r#try::<i32, &dyn std::ops::Fn() -> i32 +
std::marker::Sync + std::panic::RefUnwindSafe>` at
/home/azureuser/.rustup/toolchains/nightly-2021-07-09-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panicking.rs:365:19
= note: inside `std::panic::catch_unwind::<&dyn std::ops::Fn() -> i32 +
std::marker::Sync + std::panic::RefUnwindSafe, i32>` at
/home/azureuser/.rustup/toolchains/nightly-2021-07-09-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panic.rs:434:14
= note: inside closure at
/home/azureuser/.rustup/toolchains/nightly-2021-07-09-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/rt.rs:45:48
= note: inside
`std::panicking::r#try::do_call::<[closure@std::rt::lang_start_internal::{closure#2}],
isize>` at
/home/azureuser/.rustup/toolchains/nightly-2021-07-09-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panicking.rs:401:40
= note: inside `std::panicking::r#try::<isize,
[closure@std::rt::lang_start_internal::{closure#2}]>` at
/home/azureuser/.rustup/toolchains/nightly-2021-07-09-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panicking.rs:365:19
= note: inside
`std::panic::catch_unwind::<[closure@std::rt::lang_start_internal::{closure#2}],
isize>` at
/home/azureuser/.rustup/toolchains/nightly-2021-07-09-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panic.rs:434:14
= note: inside `std::rt::lang_start_internal` at
/home/azureuser/.rustup/toolchains/nightly-2021-07-09-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/rt.rs:45:20
= note: inside `std::rt::lang_start::<()>` at
/home/azureuser/.rustup/toolchains/nightly-2021-07-09-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/rt.rs:62:5
error: aborting due to previous error
```
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