[Java] Implement converter between Arrow record batches and Avro records
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Descrição
It would be useful for applications which need convert Avro data to Arrow data.
This is an adapter which convert data with existing API (like JDBC adapter) rather than a native reader (like orc).
We implement this function through Avro java project, receiving param like Decoder/Schema/DatumReader of Avro and return VectorSchemaRoot. For each data type we have a consumer class as below to get Avro data and write it into vector to avoid boxing/unboxing (e.g. GenericRecord#get returns Object)
```java
public class AvroIntConsumer implements Consumer {
private final IntWriter writer;
public AvroIntConsumer(IntVector vector)
{ this.writer = new IntWriterImpl(vector); }
@Override
public void consume(Decoder decoder) throws IOException
{ writer.writeInt(decoder.readInt()); writer.setPosition(writer.getPosition() + 1); }
```
We intended to support primitive and complex types (null value represented via unions type with null type), size limit and field selection could be optional for users.
**Reporter**: [Ji Liu](https://issues.apache.org/jira/browse/ARROW-5845) / @tianchen92
#### Subtasks:
- [X] [[Java] Create Avro adapter module and add dependencies](https://github.com/apache/arrow/issues/22265)
- [X] [[Java] Initial implement to convert Avro record with primitive types](https://github.com/apache/arrow/issues/22278)
- [X] [[Java] Avro adapter implement simple Record type ](https://github.com/apache/arrow/issues/22396)
- [X] [[Java] Avro adapter support convert nullable value](https://github.com/apache/arrow/issues/22439)
- [X] [[Java] Avro adapter implement unions type](https://github.com/apache/arrow/issues/22496)
- [X] [[Java] Avro adapter avoid potential resource leak.](https://github.com/apache/arrow/issues/22590)
- [X] [[Java] Add API to avro adapter to limit number of rows returned at a time.](https://github.com/apache/arrow/issues/22608)
- [X] [[Java] Avro adapter implement Array/Map/Fixed type](https://github.com/apache/arrow/issues/22649)
- [X] [[Java] Avro adapter implement Enum type and nested Record type](https://github.com/apache/arrow/issues/16862)
- [X] [[Java] Add benchmark and large fake data UT for avro adapter](https://github.com/apache/arrow/issues/22830)
- [X] [[Java] Add support for skipping decoding of columns/field in Avro converter](https://github.com/apache/arrow/issues/22949)
- [ ] [[Java] Experiment with performance difference of avoiding the use of Avro Decoder](https://github.com/apache/arrow-java/issues/281)
- [X] [[Java] Support logical type encodings from Avro](https://github.com/apache/arrow/issues/22950)
- [ ] [[Java] Avro - Experiment with "compiled" consumer delegates for performance.](https://github.com/apache/arrow-java/issues/280)
- [X] [[JAVA] Avro adapter benchmark only runs once in JMH](https://github.com/apache/arrow/issues/23064)
- [X] [[Java] Extract a common base class for avro converter consumers](https://github.com/apache/arrow/issues/23236)
- [X] [[Java] Avro converter should convert attributes and props to FieldType metadata](https://github.com/apache/arrow/issues/23755)
**Note**: *This issue was originally created as [ARROW-5845](https://issues.apache.org/jira/browse/ARROW-5845). Please see the [migration documentation](https://github.com/apache/arrow/issues/14542) for further details.*
Guia de contribuição
Direção de pesquisa
Revise as subtarefas concluídas para entender o adaptador Avro existente e, em seguida, inspecione os dois experimentos de performance restantes: evitar o Avro Decoder e usar consumer delegates compilados. A issue não nomeia arquivos de implementação, testes ou critérios de aceitação para esses experimentos; portanto, confirme o escopo pretendido com os maintainers antes de começar.
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Avaliação
- Stack de tecnologia
- java
- Domínio
- data
- Tipo de issue
- Funcionalidade
- Dificuldade
- 5/5
- Tempo estimado
- Mais de uma semana
- Status de atividade
- Estagnada
- Clareza
- Precisa de esclarecimento
- Facilidade para iniciantes
- 15/100