Github user janewangfb commented on a diff in the pull request: https://github.com/apache/spark/pull/18023#discussion_r118806698 --- 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 -- @cloud-fan I might have misunderstood your last comment "I don't think sql a-like syntax is really useful here. How about we create a special cased col function that takes a regex?". Can you clarify with some examples? Thanks.
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