Github user janewangfb commented on a diff in the pull request:
https://github.com/apache/spark/pull/18023#discussion_r118133059
--- 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 --
for this diff, we support column only.
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