Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/18023#discussion_r117691835
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala ---
@@ -1188,6 +1188,12 @@ class Dataset[T] private[sql](
def col(colName: String): Column = colName match {
case "*" =>
Column(ResolvedStar(queryExecution.analyzed.output))
+ case ParserUtils.escapedIdentifier(columnNameRegex)
--- End diff --
this is a breaking change, previously we always treat the input string as a
column name(except for star), even it's quoted.
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