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From "Zoltan Farkas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AVRO-1810) GenericDatumWriter broken with Enum
Date Thu, 14 Sep 2017 18:12:00 GMT

    [ https://issues.apache.org/jira/browse/AVRO-1810?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16166749#comment-16166749

Zoltan Farkas commented on AVRO-1810:

java.lang.Enum equals, hashCode, compareTo are final and cannot be overloaded... 

So if one would need to compare generated enums with generic enums a custom comparator would
be the way...

what is the use case you are thinking of?

> GenericDatumWriter broken with Enum
> -----------------------------------
>                 Key: AVRO-1810
>                 URL: https://issues.apache.org/jira/browse/AVRO-1810
>             Project: Avro
>          Issue Type: Bug
>          Components: java
>    Affects Versions: 1.8.0
>            Reporter: Ryon Day
>            Priority: Blocker
>             Fix For: 1.9.0, 1.8.4
> {panel:title=Description|titleBGColor=#3FA|bgColor=#DDD}
> Using the GenericDatumWriter with either Generic OR SpecificRecord will break if an Enum
is present.
> {panel}
> {panel:title=Steps To Reproduce|titleBGColor=#8DB|bgColor=#DDD}
> I have been tracking Avro decoding oddities for a while.
> The tests for this issue can be found [here|https://github.com/ryonday/avroDecodingHelp/blob/master/src/test/java/com/ryonday/test/Avro180EnumFail.java]
> {panel}
> {panel:title=Notes|titleBGColor=#3AF|bgColor=#DDD}
> Due to the debacle that is the Avro "UTF8" object, we have been avoiding it by using
the following scheme:
> * Write incoming records to a byte array using the GenericDatumWriter
> * Read back the byte array to our compiled Java domain objects using a SpecificDatumWriter
> This worked great with Avro 1.7.7, and this is a binary-incompatable breaking change
with 1.8.0.
> This would appear to be caused by an addition in the {{GenericDatumWriter:163-164}}:
> {code}
>   if (!data.isEnum(datum))
>       throw new AvroTypeException("Not an enum: "+datum);
> {code}
> {panel}

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