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https://issues.apache.org/jira/browse/FLINK-8953?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16413770#comment-16413770
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Timo Walther commented on FLINK-8953:
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Hi [~liurenjie1024], you already have contributor permissions. So feel free to
assign it to yourself. I will extend the issue description a little bit more.
> Resolve unresolved field references in FieldComputer expressions
> ----------------------------------------------------------------
>
> Key: FLINK-8953
> URL: https://issues.apache.org/jira/browse/FLINK-8953
> Project: Flink
> Issue Type: Improvement
> Components: Table API & SQL
> Reporter: Timo Walther
> Priority: Major
>
> When implementing the {{FieldComputer.getExpression}} method, it is not
> possible to use API classes but only internal expression case classes.
> It would be great to also define timestamp extractors like:
> {code}
> def getExpression(fieldAccesses: Array[ResolvedFieldReference]): Expression
> = {
> // 'x.cast(Types.LONG)
> // ExpressionParser.parseExpression("x.cast(LONG)")
> }
> {code}
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