[jira] [Updated] (SPARK-25769) UnresolvedAttribute.sql() incorrectly escapes nested columns

["Xiao Li (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-25769?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Xiao Li updated SPARK-25769:
----------------------------
    Labels:   (was: sql)

> UnresolvedAttribute.sql() incorrectly escapes nested columns
> ------------------------------------------------------------
>
>                 Key: SPARK-25769
>                 URL: https://issues.apache.org/jira/browse/SPARK-25769
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.3.2
>            Reporter: Simeon Simeonov
>            Priority: Major
>
> {{UnresolvedAttribute.sql()}} output is incorrectly escaped for nested columns
> {code:java}
> import org.apache.spark.sql.catalyst.analysis.UnresolvedAttribute
> // The correct output is a.b, without backticks, or `a`.`b`.
> $"a.b".expr.asInstanceOf[UnresolvedAttribute].sql
> // res1: String = `a.b`
> // Parsing is correct; the bug is localized to sql() 
> $"a.b".expr.asInstanceOf[UnresolvedAttribute].nameParts 
> // res2: Seq[String] = ArrayBuffer(a, b)
> {code}
> The likely culprit is that the {{sql()}} implementation does not check for {{nameParts}} being non-empty.
> {code:java}
> override def sql: String = name match { 
>   case ParserUtils.escapedIdentifier(_) | ParserUtils.qualifiedEscapedIdentifier(_, _) => name 
>   case _ => quoteIdentifier(name) 
> }
> {code}
>  



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