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https://issues.apache.org/jira/browse/AVRO-2152?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16384150#comment-16384150
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ASF GitHub Bot commented on AVRO-2152:
--------------------------------------

phaas opened a new pull request #291: AVRO-2152: Fix JsonDecoder handling of 
aliases in unions.
URL: https://github.com/apache/avro/pull/291
 
 
    - Determine aliases of any named types when generating
      the json grammer
    - When reading union, check aliases when exact match is not found.

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> JsonDecoder fails when reading record with aliases inside union
> ---------------------------------------------------------------
>
>                 Key: AVRO-2152
>                 URL: https://issues.apache.org/jira/browse/AVRO-2152
>             Project: Avro
>          Issue Type: Bug
>          Components: java
>    Affects Versions: 1.8.2
>         Environment: JDK 1.8
> Avro 1.8.2
>            Reporter: Patrick Haas
>            Priority: Major
>         Attachments: JsonDecoderAliasesInUnion.java
>
>
> The JsonDecoder only handles aliases at the "top level" or "field level". 
> Aliased records within a union fail with an "Unknown union branch" 
> AvroTypeException.
>  The same writer/read schema combination works fine with the binaryEncoder, 
> and the two schemas are considered a COMPATIBLE by the SchemaCompatibility 
> check.
>  
> h1. Writer Schema
> {
>  "type" : "record",
>  "name" : "WWrapper",
>  "namespace" : "writer.ns",
>  "doc" : "writer",
>  "fields" : [ {
>  "name" : "item",
>  "type" : [ "null", {
>  "type" : "record",
>  "name" : "WItem",
>  "doc" : "writer item",
>  "fields" : [ {
>  "name" : "value",
>  "type" : "string",
>  "doc" : "value"
>  } ]
>  } ],
>  "doc" : "value"
>  } ]
> }
> h1. Reader Schema
> {
>  "type" : "record",
>  "name" : "RWrapper",
>  "namespace" : "reader.ns",
>  "doc" : "reader",
>  "fields" : [ {
>  "name" : "item",
>  "type" : [ "null", {
>  "type" : "record",
>  "name" : "RItem",
>  "doc" : "reader item",
>  "fields" : [ {
>  "name" : "value",
>  "type" : "string",
>  "doc" : "value"
>  } ],
>  "aliases" : [ "writer.ns.WItem" ]
>  } ],
>  "doc" : "value"
>  } ],
>  "aliases" : [ "writer.ns.WWrapper" ]
> }



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