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https://issues.apache.org/jira/browse/FLINK-11229?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16731345#comment-16731345
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vinoyang commented on FLINK-11229:
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[~hequn8128] I'd like to make where/filter table API support scalar function
which receives an event and returns a boolean value as the result. Currently,
the boolean expression has many limitations, such as cannot express complex
calculation (call the thirty-party functions) and so on.
> Support ScalarFunction for the where/filter clause.
> ---------------------------------------------------
>
> Key: FLINK-11229
> URL: https://issues.apache.org/jira/browse/FLINK-11229
> Project: Flink
> Issue Type: Sub-task
> Components: Table API & SQL
> Reporter: vinoyang
> Assignee: vinoyang
> Priority: Major
>
> Currently, the where/filter clause only supports expressions, and we can
> enhance its extensibility by letting it support scalar functions.
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