dispanser opened a new issue, #1549:
URL: https://github.com/apache/arrow-rs/issues/1549
**Describe the bug**
We have an application that reads ipc stream data, and it panicked while
reading a record batch that contains a dictionary in a nested struct:
```
0: rust_begin_unwind
at
/rustc/9d1b2106e23b1abd32fce1f17267604a5102f57a/library/std/src/panicking.rs:498:5
1: core::panicking::panic_fmt
at
/rustc/9d1b2106e23b1abd32fce1f17267604a5102f57a/library/core/src/panicking.rs:116:14
2: core::panicking::panic_bounds_check
at
/rustc/9d1b2106e23b1abd32fce1f17267604a5102f57a/library/core/src/panicking.rs:84:5
3: arrow::ipc::reader::read_dictionary
at
/home/pi/src/github/dispanser/arrow-rs/arrow/src/ipc/reader.rs:573:13
4: arrow::ipc::reader::StreamReader<R>::maybe_next
at
/home/pi/src/github/dispanser/arrow-rs/arrow/src/ipc/reader.rs:983:17
5: <arrow::ipc::reader::StreamReader<R> as
core::iter::traits::iterator::Iterator>::next
at
/home/pi/src/github/dispanser/arrow-rs/arrow/src/ipc/reader.rs:1004:9
```
This is caused by an incorrectly sized `dictionaries_by_field` in the stream
reader. PR is ready, opening this for tracking purposes.
**To Reproduce**
Create a record batch containing a nested struct with a dictionary in last
position, write to IPC and attempt to read back using
`ipc::reader::StreamReader`.
**Expected behavior**
A record batch instead of a panic :)
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