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https://issues.apache.org/jira/browse/AVRO-680?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12930215#action_12930215
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David Rosenstrauch commented on AVRO-680:
-----------------------------------------
I too see the logic behind AVRO-9. But I'm also having a need in my code to
create a map with non-string keys, and without that capability built-in,
defining a schema to achieve that functionality is really ugly. e.g.:
{code:java}
...
{
"name": "KVMappings",
"type": {
"type": "array",
"items": {
"name": "KVMapping",
"type": "record",
"fields" : [
{"name": "Key", "type": "long"},
{"name": "Value", "type": "long"}
]
}
}
}
{code}
Not to mention that the code for reading/writing to/from a record with such a
schema is an ugly hack too.
Is there any way to add/restore the functionality make it possible for Avro to
create non-string-based maps?
Perhaps a good implementation would be for string-based keys to be the default,
but allowing the user to have the option to specify an alternate key type if
they desire.
Thoughts?
> Allow for non-string keys
> -------------------------
>
> Key: AVRO-680
> URL: https://issues.apache.org/jira/browse/AVRO-680
> Project: Avro
> Issue Type: Improvement
> Reporter: Jeremy Hanna
>
> Based on an email thread back in April, Doug Cutting proposed a possible
> solution for having non-string keys:
> Stu Hood wrote:
> > I can understand the reasoning behind AVRO-9, but now I need to look for an
> > alternative to a 'map' that will allow me to store an association of bytes
> > keys to values.
> A map of Foo has the same binary format as an array of records, each
> with a string field and a Foo field. So an application can use an array
> schema similar to this to represent map-like structures with, e.g.,
> non-string keys.
> Perhaps we could establish standard properties that indicate that a
> given array of records should be represented in a map-like way if
> possible? E.g.,:
> {"type": "array", "isMap": true, "items": {"type":"record", ...}}
> Doug
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