clairemcginty opened a new issue, #3816:
URL: https://github.com/apache/parquet-java/issues/3816
### Describe the enhancement requested
parquet-avro currently contains opt-in support for reading and writing both
"three-level" lists:
```
required group mylist (LIST) {
repeated group list {
required int32 element;
}
}
```
and "two level"/"legacy"/"old" lists:
```
required group mylist (LIST) {
repeated int32 array;
}
```
The boolean Configuration property `parquet.avro.write-old-list-structure`
controls which structure should be written, but readers have to specify the
`parquet.avro.write-old-list-structure` property, too, if they're either (a)
supplying a custom projection, or (b) reading a Parquet file that doesn't
contain the `parquet.avro.schema` key in its file metadata.
Ideally the reader should be able to automatically detect both types of list
encoding, so that we can keep the Configuration property as a writer-side
implementation detail.
### Component(s)
Avro
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