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https://issues.apache.org/jira/browse/AVRO-680?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Doug Cutting updated AVRO-680:
------------------------------
Attachment: AVRO-680.patch
Here's a slightly modified version of the patch. In particular:
- all changes are in a single patch file, the preferred format
- wrap lines to 80 columns
- ignore sign in hashing -- collisions already very unlikely but possible,
preserving sign does little to change that and makes names more confusing
- changed Pair names to include hex of hash rather than decimal
- removed 'reflect' from Pair name, since other impls should use same encoding
if they decide to support non-string map keys
- perhaps a few other cosmetic changes
One thing I don't understand is the change in ReflectDatumWriter. It's not
clear to me how the Pair schema generated permits one to write a collection of
java.util.Map.Entry instances. How is this working?
> Allow for non-string keys
> -------------------------
>
> Key: AVRO-680
> URL: https://issues.apache.org/jira/browse/AVRO-680
> Project: Avro
> Issue Type: Improvement
> Affects Versions: 1.7.6, 1.7.7
> Reporter: Jeremy Hanna
> Attachments: AVRO-680.patch, non_string_map_keys.zip,
> non_string_map_keys2.zip, non_string_map_keys3.zip
>
>
> 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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