Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/10451#discussion_r48501690
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicOperators.scala
---
@@ -448,7 +448,21 @@ case class Pivot(
}
}
-case class Limit(limitExpr: Expression, child: LogicalPlan) extends
UnaryNode {
+/** Factory for constructing new `Limit` nodes. */
+object Limit {
+ def apply(limitExpr: Expression, child: LogicalPlan): Limit = {
+ new Limit(limitExpr, child, optimized = false)
+ }
+}
+
+/**
+ * Take the first `limitExpr` rows.
+ * @param limitExpr The number of returned rows
+ * @param child Child operator
+ * @param optimized This node has been optimized. Note that this is only a
flag marker used
+ * to avoid adding extra `Limit` nodes to the child
operators more than once.
+ */
+case class Limit(limitExpr: Expression, child: LogicalPlan, optimized:
Boolean) extends UnaryNode {
--- End diff --
Sure, will do it. Thanks!
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