Thanks, very useful info. But, how to return the map using the schema?
eg. for record type, we could use
GenericRecord t = new GenericData.Record(s.getField("record").schema());
On Sun, Apr 10, 2011 at 9:55 PM, Felix.徐 <[email protected]> wrote:
> You can use Record or any other type supported by avro as the value type
> of Map,here is an example:
>
> {
> "name": "mapping",
> "type": "map",
> "values":{
> "type":"record",
> "name":"hi",
> "fields":[
> {"name":"a","type":"string"},
> {"name":"b","type":"string"}
> ]
> }
> }
> Also,you can use nested schma in record fileds.
>
> 2011/4/9 Weishung Chung <[email protected]>
>
>> Thanks alot, I will definitely take a look :)
>>
>>
>> On Fri, Apr 8, 2011 at 11:17 AM, Harsh J <[email protected]> wrote:
>>
>>> Yes, you can have them nested.
>>>
>>> Sounds to me like you can benefit from using Avro IDL to write your
>>> schemas. Have a look at http://avro.apache.org/docs/1.5.0/idl.html
>>>
>>> On Fri, Apr 8, 2011 at 9:43 PM, Weishung Chung <[email protected]>
>>> wrote:
>>> > hmm...could I have nested avro schemas ?
>>> > eg.
>>> > avro schema A defines the data object with multiple fields and another
>>> avro
>>> > schema B defines a container/Array/map of data objects defined by the
>>> avro
>>> > schema A.
>>> >
>>> > On Fri, Apr 8, 2011 at 10:56 AM, Harsh J <[email protected]>
>>> wrote:
>>> >>
>>> >> You can use Maps as long as their key type is limited to strings I
>>> >> think. Map<String, X> is alright (X should also be Avro-acceptable, of
>>> >> course..).
>>> >>
>>> >> On Fri, Apr 8, 2011 at 7:49 PM, Weishung Chung <[email protected]>
>>> wrote:
>>> >> > I am using Apache Avro in my project and was wondering could it be
>>> >> > possible
>>> >> > to add a field Map (TreeMap). I know that we can use Array and it
>>> works
>>> >> > but
>>> >> > I would like to be able to get by key :)
>>> >> > Thank you,
>>> >> > Wei Shung
>>> >>
>>> >>
>>> >>
>>> >> --
>>> >> Harsh J
>>> >> http://harshj.com
>>> >
>>> >
>>>
>>>
>>>
>>> --
>>> Harsh J
>>> http://harshj.com
>>>
>>
>>
>
