Error in reading a list type data in hive which was generated through pig

ArrayWritableGroupConverter in Parquet-Hive binding expects that any array field contains either 1 or 2 fields. However, the schema which PigSchemaConverter generates, doesn't honour this condition. It can be reproduced through following code

```
MessageType messageType = new PigSchemaConverter().convert(ThriftToPig.toSchema(Requestlist.class));
DataWritableGroupConverter converter = new DataWritableGroupConverter(messageType, messageType);
```

Requestlist is a thrift class
```
struct Request {
1: required string id,
2: i64 time,
3: required string source
}

struct Requestlist {
1: optional list requests
}
```

**Environment**: Parquet-Pig - 1.3.2
Hive - 0.13.1
Elephant-Bird - 4.4
**Reporter**: [Abhishek Agarwal](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=abhishek.agarwal) / @abhishekagarwal87

_{**Note**: *This issue was originally created as [PARQUET-53](https://issues.apache.org/jira/browse/PARQUET-53). Please see the [migration documentation](https://issues.apache.org/jira/browse/PARQUET-2502) for further details.*}

Parquet-Hive binding の ArrayWritableGroupConverter と PigSchemaConverter から始め、次に、報告にある Requestlist schema と DataWritableGroupConverter snippet を使って問題を再現します。生成されたリストスキーマを、converter が想定する 1 フィールドまたは 2 フィールドと照合して追跡します。完了条件は、生成されたスキーマをこの変換エラーなしで読み取れることです。

索引モデルが issue の本文から書いたものです。