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https://issues.apache.org/jira/browse/THRIFT-4495?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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James E. King III closed THRIFT-4495.
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> Erlang records should allow 'undefined' for non-required fields
> ---------------------------------------------------------------
>
> Key: THRIFT-4495
> URL: https://issues.apache.org/jira/browse/THRIFT-4495
> Project: Thrift
> Issue Type: Improvement
> Components: Erlang - Compiler
> Affects Versions: 0.11.0
> Reporter: David Hull
> Assignee: David Hull
> Priority: Major
> Fix For: 0.12.0
>
>
> The Erlang records created by the Erlang code generator allow only the type
> declared by the Thrift definition file. If a field is not required, however,
> the Erlang record should also allow the value {{undefined}} (this is similar
> to a null value in other languages).
> Erlang includes a tool, dialyzer, that does type analysis of Erlang code.
> Until Erlang 19, dialyzer implicitly added `undefined` as an allowed type for
> all record fields, but as of Erlang 19 it no longer does. This means that
> dialyzer now emits error messages whenever a record is constructed and
> initial values are not specified for all of its fields.
> So, for example, the following thrift definition
> {noformat}
> struct Test {
> 1: required i32 a
> 2: i32 b
> 3: optional i32 c
> }{noformat}
> currently produced the following Erlang record:
> {noformat}
> -record('Test', {'a' :: integer(),
> 'b' :: integer(),
> 'c' :: integer()}).{noformat}
> However it should produce the following:
> {noformat}
> -record('Test', {'a' :: integer(),
> 'b' :: integer() | undefined,
> 'c' :: integer() | undefined}).{noformat}
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