Julian Hyde commented on CALCITE-1929:

And a further fix in 

> Deprecate class RelDataTypeFactory.FieldInfoBuilder
> ---------------------------------------------------
>                 Key: CALCITE-1929
>                 URL: https://issues.apache.org/jira/browse/CALCITE-1929
>             Project: Calcite
>          Issue Type: Bug
>            Reporter: Julian Hyde
>            Assignee: Julian Hyde
>             Fix For: 1.14.0
> Since interface {{RelDataTypeFactory.FieldInfo}} is deprecated, and 
> {{RelDataTypeFactory.FieldInfoBuilder}} implements it, we should also 
> deprecate {{FieldInfoBuilder}}.
> We will create a new class {{RelDataTypeFactory.Builder}} that does the same 
> as {{FieldInfoBuilder}} without implementing the {{FieldInfo}} interface.
> For backwards compatibility, {{RelDataTypeFactory.builder()}} will continue 
> to return {{FieldInfoBuilder}} but we recommend that you assign the result to 
> a variable of type {{Builder}}. Thus you won't be using the deprecated class 
> in your code.

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