Github user janewangfb commented on a diff in the pull request: https://github.com/apache/spark/pull/18023#discussion_r117398110 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/unresolved.scala --- @@ -84,6 +84,33 @@ case class UnresolvedTableValuedFunction( } /** + * Represents all of the input attributes to a given relational operator, for example in + * "SELECT `(id)?+.+` FROM ...". + * + * @param table an optional table that should be the target of the expansion. If omitted all + * tables' columns are produced. + */ +case class UnresolvedRegex(expr: String, table: Option[String]) extends Star with Unevaluable { + override def expand(input: LogicalPlan, resolver: Resolver): Seq[NamedExpression] = { + val expandedAttributes: Seq[Attribute] = table match { + // If there is no table specified, use all input attributes that match expr + case None => input.output.filter(_.name.matches(expr)) + // If there is a table, pick out attributes that are part of this table that match expr + case Some(t) => input.output.filter(_.qualifier.filter(resolver(_, t)).nonEmpty) --- End diff -- updated.
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