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https://issues.apache.org/jira/browse/KYLIN-5694?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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liyang closed KYLIN-5694.
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> Concat function supports 0 or 1 parameter
> -----------------------------------------
>
> Key: KYLIN-5694
> URL: https://issues.apache.org/jira/browse/KYLIN-5694
> Project: Kylin
> Issue Type: Bug
> Components: Query Engine
> Affects Versions: 5.0-beta
> Reporter: Yaguang Jia
> Assignee: Yaguang Jia
> Priority: Minor
> Fix For: 5.0.0
>
>
> h2. Design
> Kylin5 currently does not support UDFs with only one parameter. However,
> Spark and Hive do support it. Additionally, it has been verified that Spark
> and Hive also support concat with zero parameters. Here, we are adding
> support for Kylin5 to handle both zero and one parameter cases.
>
> ----
>
> Kylin5当前自定义的 udf 不支持一个参数的。但是 spark 和 hive 支持。同时还验证了一下 spark 和 hive 还支持 concat
> 为0 个参数的情况。这里对增加Kylin5对0个和1个参数的支持。
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