[jira] [Closed] (ARROW-5845) [Java] Implement converter between Arrow record batches and Avro records

["Ji Liu (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-5845?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ji Liu closed ARROW-5845.
-------------------------
    Fix Version/s: 0.15.0
       Resolution: Done

> [Java] Implement converter between Arrow record batches and Avro records
> ------------------------------------------------------------------------
>
>                 Key: ARROW-5845
>                 URL: https://issues.apache.org/jira/browse/ARROW-5845
>             Project: Apache Arrow
>          Issue Type: New Feature
>          Components: Java
>            Reporter: Ji Liu
>            Assignee: Ji Liu
>            Priority: Minor
>             Fix For: 0.15.0
>
>
> 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)
> {code: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); }
> {code}
> 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. 



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