[jira] [Assigned] (KYLIN-5359) Kylin4 replace function expression convert error

["Liu Zhao (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KYLIN-5359?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Liu Zhao reassigned KYLIN-5359:
-------------------------------

    Assignee: Liu Zhao

> Kylin4 replace function expression convert error
> ------------------------------------------------
>
>                 Key: KYLIN-5359
>                 URL: https://issues.apache.org/jira/browse/KYLIN-5359
>             Project: Kylin
>          Issue Type: Bug
>          Components: Query Engine
>    Affects Versions: v4.0.1, v4.0.2
>            Reporter: Liu Zhao
>            Assignee: Liu Zhao
>            Priority: Major
>         Attachments: image-2022-12-12-11-25-32-037.png, image-2022-12-12-11-25-41-178.png
>
>
> 查询语句形如：select name, replace(name, substring(name, 1, 1), '--') as new_name from LZ_TEST_YUFA 执行出错
> errorMsg：java.lang.ClassCastException: org.apache.spark.sql.Column cannot be cast to java.lang.String while executing SQL: "select * from (select name, replace(name, substring(name, 1, 1), '--') as new_name from LZ_TEST_YUFA) limit 50000
> 原因：在ExpressionConverter中subtring返回的是一个column对象，而在replace转换中强制将函数参数转换为string
> {code:java}
> // ExpressionConverter
> case "replace " =>
> 	regexp_replace(k_lit(children.head),
> 	  {color:red}children.apply(1).asInstanceOf[String],
> 	  children.apply(2).asInstanceOf[String]{color})
> case "substring" | "substr" =>
> 	if (children.length == 3) { //substr(str1,startPos,length)
> 	 {color:red} k_lit(children.head)
> 		.substr(k_lit(children.apply(1)), k_lit(children.apply(2))){color}
> 	} else if (children.length == 2) { //substr(str1,startPos)
> 	  k_lit(children.head).
> 		substr(k_lit(children.apply(1)), k_lit(Int.MaxValue))
> 	} else {
> 	  throw new UnsupportedOperationException(
> 		s"substring must provide three or two parameters under sparder")
> 	}
> case "initcapb" =>
> 	initcap(k_lit(children.head))
> {code}
>  !image-2022-12-12-11-25-32-037.png! 
>  !image-2022-12-12-11-25-41-178.png! 



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