Parquet file containing arrays, written by Parquet-MR, cannot be read again by Parquet-MR

In the attached files, there is one original file, and one written modified file that results after reading the original file and writing it back with Parquet-MR, with a few values modified. The schema should not be modified, since the schema of the input file is used as the schema to write the output file. However, the output file has a slightly modified schema that then cannot be read back the same way again with Parquet-MR, resulting in the exception message:  java.lang.ClassCastException: optional binary element (STRING) is not a group

My guess is that the issue lies in the Avro schema conversion.

The Parquet files attached have some arrays and some nested fields.

**Environment**: Windows 10
**Reporter**: [Devon Kozenieski](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=devonk)
#### Related issues:
- [parquet schema conflict: optional binary (UTF8) is not a group](https://issues.apache.org/jira/browse/HUDI-864) (is depended upon by)
#### Original Issue Attachments:
- [modified.parquet](https://issues.apache.org/jira/secure/attachment/13030885/modified.parquet)
- [original.parquet](https://issues.apache.org/jira/secure/attachment/13030884/original.parquet)
- [parquet-diff.png](https://issues.apache.org/jira/secure/attachment/13042124/parquet-diff.png)

_{**Note**: *This issue was originally created as [PARQUET-2069](https://issues.apache.org/jira/browse/PARQUET-2069). Please see the [migration documentation](https://issues.apache.org/jira/browse/PARQUET-2502) for further details.*}

Beginne mit dem Vergleich der angehängten Dateien original.parquet und modified.parquet und verfolge anschließend die beim Lesen und erneuten Schreiben verschachtelter Arrays durch Parquet-MR verwendete Avro-Schema-Konvertierung zurück. Reproduziere die ClassCastException beim Lesen der neu geschriebenen Datei; fertig ist die Aufgabe, wenn das Schema kompatibel bleibt und die Ausgabe von Parquet-MR erneut gelesen werden kann.

Vom Indexierungsmodell aus dem Issue-Text verfasst.