Github user jaceklaskowski commented on a diff in the pull request:
https://github.com/apache/spark/pull/14435#discussion_r73334242
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicLogicalOperators.scala
---
@@ -739,6 +931,15 @@ case class Sample(
case class Distinct(child: LogicalPlan) extends UnaryNode {
override def maxRows: Option[Long] = child.maxRows
override def output: Seq[Attribute] = child.output
+
+ override def sql: String = child match {
+ case Union(children) =>
+ val childrenSql = children.map(c => s"(${c.sql})")
+ childrenSql.mkString(" UNION DISTINCT ")
+
+ case _: Project =>
--- End diff --
Replace `_` to `p` and use it instead.
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