Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/18023#discussion_r117807843 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/unresolved.scala --- @@ -84,6 +84,28 @@ 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(regexPattern: String, table: Option[String]) + extends Star with Unevaluable { + override def expand(input: LogicalPlan, resolver: Resolver): Seq[NamedExpression] = { + table match { + // If there is no table specified, use all input attributes that match expr + case None => input.output.filter(_.name.matches(regexPattern)) + // If there is a table, pick out attributes that are part of this table that match expr --- End diff -- ``` * @param target an optional name that should be the target of the expansion. If omitted all * targets' columns are produced. This can either be a table name or struct name. This * is a list of identifiers that is the path of the expansion. ``` shall we support ```record.`(id)?+.+` ```?
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