sarutak commented on a change in pull request #31754:
URL: https://github.com/apache/spark/pull/31754#discussion_r589551867
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/unresolved.scala
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@@ -141,8 +140,7 @@ case class UnresolvedTableValuedFunction(
*/
case class UnresolvedAttribute(nameParts: Seq[String]) extends Attribute with
Unevaluable {
- def name: String =
- nameParts.map(n => if (n.contains(".")) s"`$n`" else n).mkString(".")
+ def name: String = nameParts.map(n => if (n.contains(".")) s"`$n`" else
n).mkString(".")
Review comment:
I think, this is correct.
If a backtick is a part of attribute name, it should be escaped with an
additional backtick.
Then, an attribute name which contains escaped backticks should be enclosed
by backticks.
MySQL handles such case with the same manner.
https://dev.mysql.com/doc/refman/8.0/en/identifiers.html
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