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POHow to define Avro union in java
 

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  1. POHow to define Avro union in java
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    <p>I have defined an Avro schema composed of a record which contains a union of two (or more) different records such as:</p> <pre><code>{ "type":"record", "name":"MyCompositeRecord", "fields": [ {"name":"SomeCommonData","type":"string"}, {"name":"MoreCommonData","type":"float"}, {"name":"CompositeRecord","type": [ { "type":"record", "name":"FirstOption", "fields": [ {"name":"x","type":"string"}, {"name":"y","type":"long"} ] }, { "type":"record", "name":"SecondOption", "fields": [ {"name":"z","type":"int"}, {"name":"w","type":"float"}, {"name":"m","type":"double"}, {"name":"l","type":"boolean"} ] } ] } ] } </code></pre> <p>It doesn't look very clear but I hope you get the idea: I have a record composed of some data ("SomeCommonData" and "MoreCommonData") and a union of two different types of records ("FirstOption" and "SecondOption"). At serialization/deserialization time I should be able to create either one of the two sub-records and serialize a "MyCompositeRecord".</p> <p>I haven't tried generating code for the schema since I'm planning on using just generic records. However, I'm not sure if and how such generic records can be serialized. I can't find any example online. I'm going to use java to serialized/deserialize. I was able to create a writer/reader for the schema as follows:</p> <pre><code>Schema.Parser parser = new Schema.Parser(); Schema schema = parser.parse(COMPOSITE_SCHEMA); DatumWriter&lt;GenericRecord&gt; writer = new GenericDatumWriter&lt;&gt;(schema); DatumReader&lt;GenericRecord&gt; reader = new GenericDatumReader&lt;&gt;(schema); GenericRecord datum = new GenericData.Record(schema); </code></pre> <p>Any ideas on how to proceed from here to actually build the record?</p> <p>Thanks</p>
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    1. USGiovanni Botta
    1. USGiovanni Botta
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