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https://issues.apache.org/jira/browse/FLINK-11243?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dian Fu closed FLINK-11243.
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Resolution: Duplicate
> GroupBy udf() can not be select in TableAPI
> -------------------------------------------
>
> Key: FLINK-11243
> URL: https://issues.apache.org/jira/browse/FLINK-11243
> Project: Flink
> Issue Type: Bug
> Components: Table API & SQL
> Affects Versions: 1.8.0
> Reporter: sunjincheng
> Assignee: Dian Fu
> Priority: Major
>
> The group key can not be select in the follows TableAPI:
> {code:java}
> val result = order
> .groupBy('o_time.substring(1, 16))
> .select('o_time.substring(1, 16), 'o_id.count){code}
> Exception:
> {code:java}
> org.apache.flink.table.api.ValidationException: Cannot resolve field [o_time]
> given input [('o_time).substring(1, 16), TMP_0].
> at
> org.apache.flink.table.plan.logical.LogicalNode.failValidation(LogicalNode.scala:156){code}
> BTW, We can only use the following description to avoid the above problem.
> {code:java}
> val result = order
> .select('o_id, 'c_id, 'o_time.substring(1, 16) as 'key)
> .groupBy('key)
> .select('key, 'o_id.count)
> {code}
> But I think it is better to make `groupby udf()` can be select in TableAPI.
> What do you think?
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