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https://issues.apache.org/jira/browse/THRIFT-110?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12623904#action_12623904
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Noble Paul commented on THRIFT-110:
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bq.I'll reiterate that having a list<?> type that could contain two different 
structures would be prohibitively expensive

I understand that it may be more expensive. But how much more expensive ? What 
are the implementation details? do we really need to write a string for a type? 
or can we manage to write a short code? what if the user needs that feature and 
is willing to pay a small price for that? 

The wildcard type must not be the default so regular users do not pay a price. 

> A more compact format 
> ----------------------
>
>                 Key: THRIFT-110
>                 URL: https://issues.apache.org/jira/browse/THRIFT-110
>             Project: Thrift
>          Issue Type: Improvement
>            Reporter: Noble Paul
>
> Thrift is not very compact in writing out data as (say protobuf) . It does 
> not have the concept of variable length integers and various other 
> optimizations possible . In Solr we use a lot of such optimizations to make a 
> very compact payload. Thrift has a lot common with that format.
> It is all done in a single class
> http://svn.apache.org/viewvc/lucene/solr/trunk/src/java/org/apache/solr/common/util/NamedListCodec.java?revision=685640&view=markup
> The other optimizations include writing type/value  in same byte, very fast 
> writes of Strings, externalizable strings etc 
> We could use a thrift format for non-java clients and I would like to see it 
> as compact as the current java version

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