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https://issues.apache.org/jira/browse/FLINK-1245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14224409#comment-14224409
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ASF GitHub Bot commented on FLINK-1245:
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Github user twalthr commented on the pull request:
https://github.com/apache/incubator-flink/pull/203#issuecomment-64385776
All generic type serializers are mutable types, but if we only have Object
as type information we cannot create instances of it. Additionally, e.g. in
case of a Tuple we may have the information that we have a Tuple2 but without
generic information. The UnkownTypeSerializer supports both cases.
> Introduce TypeHints for Java API operators
> ------------------------------------------
>
> Key: FLINK-1245
> URL: https://issues.apache.org/jira/browse/FLINK-1245
> Project: Flink
> Issue Type: Improvement
> Components: Java API
> Reporter: Timo Walther
> Assignee: Timo Walther
>
> Due to type extraction issues with Java 8 Lambdas and many users with type
> erasure issues, TypeHints need to be introduced.
> The whole discussion can be found on the mailing list:
> http://mail-archives.apache.org/mod_mbox/flink-dev/201410.mbox/%[email protected]%3E
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