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https://issues.apache.org/jira/browse/THRIFT-1528?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13226951#comment-13226951
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Jake Farrell commented on THRIFT-1528:
--------------------------------------
using the following example of a update service you can not tell if an optional
primitive parameter was set or its using the default value without isset.
service User(id, optional string name, optional bool isAwesome=false)
first call User(id=1, isAwesome=true)
second call User(id=1, name="foo")
If the second call had to serialize the default optional value no matter what
it would cause "foo" to no longer be awesome even thought it was originally set
in the first call and was an optional parameter for the second call. I would
prefer to go with nullable types across the board as well, but since this
currently is not an option for primitives I think we need to keep isset for
those types for now.
> Iconsistency in optional fields between Java/C# and python
> ----------------------------------------------------------
>
> Key: THRIFT-1528
> URL: https://issues.apache.org/jira/browse/THRIFT-1528
> Project: Thrift
> Issue Type: Bug
> Components: Python - Compiler
> Affects Versions: 0.8
> Reporter: Stefan Gmeiner
> Priority: Minor
>
> If a struct contains optional fields with default values the generated python
> code serialize differently than Java or C# code.
> In Java or C# optional fields are only serialized if a field was set by the
> client. If not the field is omited during serialization. This is possible
> because C#/Java maintains for each field a 'isset'-boolean which records if a
> field was set or not.
> However the generated python code does not have such a 'isset'-structure. It
> writes every field which is not equal None. As the constructor initialize the
> optional fields with their default value, these fields are written whether
> they are set or not.
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