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https://issues.apache.org/jira/browse/FLINK-8094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16255516#comment-16255516
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Fabian Hueske commented on FLINK-8094:
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+1 for having a rowtime extractor for string fields.
As a first approach, we can use a String to Timestamp Cast expression that
expects a timestamp in standard formatting.
Later we can add dedicated parse expressions for timestamp and date to the
Table API expressions. That way we don't need a UDF.
I'd add support for UDFs in extractors as a separate step.
> Support other types for ExistingField rowtime extractor
> -------------------------------------------------------
>
> Key: FLINK-8094
> URL: https://issues.apache.org/jira/browse/FLINK-8094
> Project: Flink
> Issue Type: Improvement
> Components: Table API & SQL
> Affects Versions: 1.4.0, 1.5.0
> Reporter: Xingcan Cui
>
> Currently, the {{ExistingField}} rowtime extractor only supports {{Long}} and
> {{Timestamp}} fields. To enable other data types (e.g., {{String}}), we can
> provide some system extraction functions and allow users to pass some
> parameters via the constructor of {{ExistingField}}. There's [a simple
> demo|https://github.com/xccui/flink/commit/afcc5f1a0ad92db08294199e61be5df72c1514f8]
> which enables the {{String}} type rowtime by adding a UDF {{str2EventTime}}.
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