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https://issues.apache.org/jira/browse/FLINK-4655?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15888260#comment-15888260
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Ufuk Celebi commented on FLINK-4655:
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[~twalthr], [~fhueske] is this issue still relevant?
> Add tests for validation of Expressions
> ---------------------------------------
>
> Key: FLINK-4655
> URL: https://issues.apache.org/jira/browse/FLINK-4655
> Project: Flink
> Issue Type: Test
> Components: Table API & SQL
> Reporter: Timo Walther
>
> Currently, it is only tested if Table API expressions work if the input is
> correct. The validation method of expressions is not tested. The
> {{ExpressionTestBase}} should be extended to provide means to also test
> invalid expressions.
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