Github user janewangfb commented on a diff in the pull request:
https://github.com/apache/spark/pull/18023#discussion_r117797804
--- 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 --
no. this improves the current behavior. when it is `a`, if a is the column
name, it will expand to just column a. if it is `(a)?+.+`, it will be treated
it as regular expression and expand. (the current behavior is to throw
AnalysisException.
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