Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/18023#discussion_r118145019
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/parser/ParserUtils.scala
---
@@ -177,6 +177,12 @@ object ParserUtils {
sb.toString()
}
+ /** the column name pattern in quoted regex without qualifier */
+ val escapedIdentifier = "`(.+)`".r
+
+ /** the column name pattern in quoted regex with qualifier */
+ val qualifiedEscapedIdentifier = ("(.+)" + """.""" + "`(.+)`").r
--- End diff --
these 2 seems hacky to me, we can always create `UnresolvedRegex` if the
config is on, and `UnresolvedAttribute` otherwise.
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