wgtmac opened a new pull request, #466:
URL: https://github.com/apache/parquet-format/pull/466
### Rationale for this change
The C++ reader of parquet-cpp is having a hard time to read Parquet file
written by parquet-java with `parquet.avro.write-old-list-structure=true` and
schema below:
```
optional group a (LIST) {
repeated group array (LIST) {
repeated int32 array;
}
}
```
See https://github.com/apache/arrow/issues/43994 and
https://github.com/apache/arrow/pull/43995
### What changes are included in this PR?
Clarify the rules and add an example.
### Do these changes have PoC implementations?
Not required
Closes #465
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