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https://issues.apache.org/jira/browse/FLINK-3702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15295698#comment-15295698
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Gabor Gevay commented on FLINK-3702:
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This turned out to be more complicated than I thought, but I'm 80% done. I'll
try to wrap it up in the next few days.
I'm refactoring FieldAccessor, so that it will be created from a method of the
TypeInfos, instead of the static method FieldAccessor.create. This makes it
possible to process the outermost part of a field expression and then recurse
into the specified field's TypeInfo with the rest of the field expression.
> DataStream API PojoFieldAccessor doesn't support nested POJOs
> -------------------------------------------------------------
>
> Key: FLINK-3702
> URL: https://issues.apache.org/jira/browse/FLINK-3702
> Project: Flink
> Issue Type: Improvement
> Components: DataStream API
> Affects Versions: 1.0.0
> Reporter: Robert Metzger
> Assignee: Gabor Gevay
>
> The {{PojoFieldAccessor}} (which is used by {{.sum(String)}} and similar
> methods) doesn't support nested POJOs right now.
> As part of FLINK-3697 I'll add a check for a nested POJO and fail with an
> exception.
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