Hive Avro to Parquet table conversion

Hi.
I have following avro schema

```Java
{
"namespace" : "com.example.test",
"type" : "record",
"name" : "TestRecord",
"fields" : [{"name" : "objectLink", "type" : [
{"type": "record", "name" : "TestObj1", "fields" : [{"name":"obj1VisitorId","type":["null","string"]}] },
{"type": "record", "name" : "TestObj2", "fields" : [{"name":"obj2VisitorId","type":["null","string"]}]}
]
}],
"doc" : "event for test purposes"
}
```

Using this schema I can create avro objects, also I'm able to create table backed by avro in Hive. But then I want to create a table backed by parquet I'm doing

CREATE TABLE parquet_table
STORED AS parquet
AS SELECT \* FROM avro_table

and i get
SemanticException java.lang.UnsupportedOperationException: Unknown field type: uniontype,struct>

Is there a way to convert such structures, to store them in hive backed as parquet? This is a simple example, but I have big data structure described in avro, so I can't convert it manually, and also I have data which already stored in avro and need to be loaded in table, backed by parquet. Is there any way to this?

I'm using hive 0.13.

**Reporter**: [Dmitriy](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=dimaga) / @dimaga

_{**Note**: *This issue was originally created as [PARQUET-155](https://issues.apache.org/jira/browse/PARQUET-155). Please see the [migration documentation](https://issues.apache.org/jira/browse/PARQUET-2502) for further details.*}

参照されている移行ドキュメントを読み、ネストされた union スキーマを使用して Hive 0.13 CREATE TABLE parquet_table STORED AS parquet AS SELECT * FROM avro_table クエリを再現してください。報告されている Unknown field type: uniontype エラーを出発点とし、この構造を Parquet に変換するための文書化または実装されたパスが用意されていれば完了です。

索引モデルが issue の本文から書いたものです。