Allow for heterogeneous collections
-----------------------------------

                 Key: THRIFT-122
                 URL: https://issues.apache.org/jira/browse/THRIFT-122
             Project: Thrift
          Issue Type: New Feature
            Reporter: Noble Paul


Currently thrift only supports homogeneous collections . But , that is very 
restrictive for many languages which allows heterogeneous collections

implementation details 

the IDL can allow syntax 
{code}
list<?>
set<?>
map<?,?>
map<?,the-type>
map<the-type,?>
{code}


While writing down data use a type modifier to say whether key (1), value(2) or 
both(3) are wild cards
for a List/Set use a type modifier 1 to specify that it is heterogeneous

If it is a homogeneous collection do it the way it is done now.

Or else

add type information just before the data. So it adds an extra byte/element 

For ma



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