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https://issues.apache.org/jira/browse/FLINK-6602?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16038991#comment-16038991
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Fabian Hueske commented on FLINK-6602:
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I think we should allow {{null}} to indicate that no time attribute should be
added.
Otherwise we need TableSource implementations for all combinations of none,
event-time, processing-time, and both.
> Table source with defined time attributes allows empty string
> -------------------------------------------------------------
>
> Key: FLINK-6602
> URL: https://issues.apache.org/jira/browse/FLINK-6602
> Project: Flink
> Issue Type: Bug
> Components: Table API & SQL
> Reporter: Timo Walther
>
> {{DefinedRowtimeAttribute}} and {{DefinedProctimeAttribute}} are not checked
> for empty strings.
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