[jira] Commented: (AVRO-590) IDL: order specifications don't work

[Doug Cutting (JIRA)]

    [ 
https://issues.apache.org/jira/browse/AVRO-590?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12884409#action_12884409
 ] 

Doug Cutting commented on AVRO-590:
-----------------------------------

Currently the IDL documentation suggests using something like:

{code}
@order("decreasing") int foo;
{code}

but this generates a field like:

{code}
{"name": "foo", "type": {"name": "int", "order": "decreasing"}}
{code}

but order is not a property of the int type but rather of the foo field, so 
this should rather be:

{code}
{"name": "foo", "type": "int", "order": "decreasing"}
{code}

One proposal is to change the syntax for order specification to use a keyword 
like:

{code}
decreasing int foo;
{code}

This would still permit @ to be used to specify attributes on the type, but not 
on the field.  Alternately we might change @ to modify field attributes rather 
than type attributes.  Or maybe the two could be distinguished by position 
relative to the type and field name, e.g.,

{code}
@order("decreasing") int @java-class("java.math.BigInteger") foo;
{code}

would specify one field and one type property, translating to:

{code}
{"name": "foo", 
  "type": {"name": "int", "java-class":" "java.math.BigInteger"}, 
  "order": "decreasing"
}
{code}

Thoughts?


> IDL: order specifications don't work
> ------------------------------------
>
>                 Key: AVRO-590
>                 URL: https://issues.apache.org/jira/browse/AVRO-590
>             Project: Avro
>          Issue Type: Bug
>          Components: java
>            Reporter: Doug Cutting
>            Assignee: Doug Cutting
>             Fix For: 1.4.0
>
>
> The IDL compiler has a mechanism for specifying field ordering, but it 
> doesn't work.

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