Github user huaxingao commented on a diff in the pull request:
https://github.com/apache/spark/pull/22788#discussion_r227152273
--- Diff: sql/core/src/test/scala/org/apache/spark/sql/SQLQuerySuite.scala
---
@@ -2702,7 +2702,7 @@ class SQLQuerySuite extends QueryTest with
SharedSQLContext {
val e = intercept[AnalysisException](sql("SELECT v.i from (SELECT i
FROM v)"))
assert(e.message ==
- "cannot resolve '`v.i`' given input columns:
[__auto_generated_subquery_name.i]")
--- End diff --
The out-most backticks is added in
```case _```, in ```case class UnresolvedAttribute(nameParts:
Seq[String])```
```
override def sql: String = name match {
case ParserUtils.escapedIdentifier(_) |
ParserUtils.qualifiedEscapedIdentifier(_, _) => name
case _ => quoteIdentifier(name)
}
```
the ```nameParts``` is a Seq of ```"v" "i"```, name is ```v.i```
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