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https://issues.apache.org/jira/browse/FLINK-5792?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15869029#comment-15869029
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Jark Wu commented on FLINK-5792:
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+1
The serialization way will be more flexible.
> Improve “UDF/UDTF" to support constructor with parameter.
> ---------------------------------------------------------
>
> Key: FLINK-5792
> URL: https://issues.apache.org/jira/browse/FLINK-5792
> Project: Flink
> Issue Type: Improvement
> Components: Table API & SQL
> Reporter: sunjincheng
> Assignee: sunjincheng
>
> Currently UDF/UDTF in the codegen phase using a nonparametric constructor to
> create the instance, causing the user can not include the state value in the
> UDF/UDTF. The UDF/UDTF's codegen phase can use a serialized mechanism so that
> the UDTF can contain state values.
> 1. UserDefinedFunction inherits Serializable.
> 2. Modify CodeGenerator about UDF/UDTF part.
> 3. Modify TableAPI about UDF/UDTF
> 4. Add Test.
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