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https://issues.apache.org/jira/browse/FLINK-5589?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15831813#comment-15831813
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Fabian Hueske commented on FLINK-5589:
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I did not look into the code, but you should consider the object as changed
when you called a method on the iterator.
I do not recall right now whether `hasNext()` is OK or if it might cause a
mutation as well.
> Tumbling group windows on batch tables do not consider object reuse
> -------------------------------------------------------------------
>
> Key: FLINK-5589
> URL: https://issues.apache.org/jira/browse/FLINK-5589
> Project: Flink
> Issue Type: Bug
> Components: Table API & SQL
> Reporter: Timo Walther
>
> The tumbling group windows on batch tables might not work properly when
> object reuse mode is enabled.
> See:
> https://ci.apache.org/projects/flink/flink-docs-release-1.2/dev/batch/index.html#object-reuse-enabled
> "Do not remember input objects received from an Iterable."
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