Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/22344#discussion_r218630241
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/limit.scala ---
@@ -98,7 +98,8 @@ case class LocalLimitExec(limit: Int, child: SparkPlan)
extends UnaryExecNode wi
/**
* Take the `limit` elements of the child output.
*/
-case class GlobalLimitExec(limit: Int, child: SparkPlan) extends
UnaryExecNode {
+case class GlobalLimitExec(limit: Int, child: SparkPlan,
+ orderedLimit: Boolean = false) extends
UnaryExecNode {
--- End diff --
When limit number is more than `SQLConf.TOP_K_SORT_FALLBACK_THRESHOLD`, the
planner won't choose `TakeOrderedAndProjectExec` to perform the sort + limit
operation.
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