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https://issues.apache.org/jira/browse/FLINK-7627?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16260180#comment-16260180
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ASF GitHub Bot commented on FLINK-7627:
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Github user wuchong commented on the issue:
https://github.com/apache/flink/pull/4674
I'm +1 with the first option, i.e. declare the element field as
`transient`. You are right, the `SingleElementIterable` is not necessary to be
serialized.
> SingleElementIterable should implement with Serializable
> ---------------------------------------------------------
>
> Key: FLINK-7627
> URL: https://issues.apache.org/jira/browse/FLINK-7627
> Project: Flink
> Issue Type: Bug
> Components: Table API & SQL
> Reporter: Hequn Cheng
> Assignee: Hequn Cheng
>
> {{SingleElementIterable}} is used to merge accumulators and it should be
> serializable considering that it will be serialized when doing checkpoint.
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