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https://issues.apache.org/jira/browse/AVRO-3182?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shawn Wu updated AVRO-3182:
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Summary: Avro in Java cannot parse the union schema in stream from C#
(was: Java cannot parse the union schema in stream from C#)
> Avro in Java cannot parse the union schema in stream from C#
> ------------------------------------------------------------
>
> Key: AVRO-3182
> URL: https://issues.apache.org/jira/browse/AVRO-3182
> Project: Apache Avro
> Issue Type: Bug
> Components: csharp
> Affects Versions: 1.10.2
> Reporter: Shawn Wu
> Priority: Critical
>
> Version: 1.10.2
> I need to transfer data from C# to Java. But I found Avro in Java cannot
> parse the union schema in the stream from C#.
> The error message:
> {code:java}
> org.apache.avro.SchemaParseException: No type:
> {"type":[{"type":"record","name":"columnCount","namespace":"avro.test.header","fields":[{"name":"columnCount","type":"int"}]},{"type":"record","name":"errorMessage","namespace":"avro.test.header","fields":[{"name":"errorMessage","type":["string","null"]}]}]}org.apache.avro.SchemaParseException:
> No type:
> {"type":[{"type":"record","name":"columnCount","namespace":"avro.test.header","fields":[{"name":"columnCount","type":"int"}]},{"type":"record","name":"errorMessage","namespace":"avro.test.header","fields":[{"name":"errorMessage","type":["string","null"]}]}]}
> at org.apache.avro.Schema.getRequiredText(Schema.java:1784) at
> org.apache.avro.Schema.parse(Schema.java:1637) at
> org.apache.avro.Schema$Parser.parse(Schema.java:1425) at
> org.apache.avro.Schema$Parser.parse(Schema.java:1413) at
> org.apache.avro.file.DataFileStream.initialize(DataFileStream.java:130) at
> org.apache.avro.file.DataFileStream.<init>(DataFileStream.java:90) at
> avro.AvroService.read(AvroService.java:68) at
> avro.AvroService$1.onResponse(AvroService.java:144) at
> okhttp3.internal.connection.RealCall$AsyncCall.run(RealCall.kt:519) at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:748)
> {code}
>
> When I use Avro in C#, I found Schema.ToString() will add an extra *type*
> property in JSON string for union schema.
> However, the correct union schema is a JSON array.
>
> This is my test code in C#:
> {code:java}
> var columnCountSchema =
> Schema.Parse("{\"type\":\"record\",\"name\":\"columnCount\",\"namespace\":\"avro.test.header\",\"fields\":[{\"name\":\"columnCount\",\"type\":\"int\"}]}");
> var errorMessageSchema =
> Schema.Parse("{\"type\":\"record\",\"name\":\"errorMessage\",\"namespace\":\"avro.test.header\",\"fields\":[{\"name\":\"errorMessage\",\"type\":[\"string\",\"null\"]}]}");
> var schema = Schema.Parse($"[{columnCountSchema},{errorMessageSchema}]");
> Console.WriteLine(schema.ToString());{code}
> The actual output:
> {code:java}
> {"type":[{"type":"record","name":"columnCount","namespace":"avro.test.header","fields":[{"name":"columnCount","type":"int"}]},{"type":"record","name":"errorMessage","namespace":"avro.test.header","fields":[{"name":"errorMessage","type":["string","null"]}]}]}
> {code}
> The expected output:
> {code:java}
> [{"type":"record","name":"columnCount","namespace":"avro.test.header","fields":[{"name":"columnCount","type":"int"}]},{"type":"record","name":"errorMessage","namespace":"avro.test.header","fields":[{"name":"errorMessage","type":["string","null"]}]}]
> {code}
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