wangyum commented on code in PR #37118:
URL: https://github.com/apache/spark/pull/37118#discussion_r916916958
##########
sql/core/src/main/scala/org/apache/spark/sql/execution/limit.scala:
##########
@@ -283,20 +283,7 @@ case class TakeOrderedAndProjectExec(
}
override def executeCollect(): Array[InternalRow] = {
- val orderingSatisfies = SortOrder.orderingSatisfies(child.outputOrdering,
sortOrder)
- val ord = new LazilyGeneratedOrdering(sortOrder, child.output)
- val limited = if (orderingSatisfies) {
-
child.execute().mapPartitionsInternal(_.map(_.copy()).take(limit)).takeOrdered(limit)(ord)
- } else {
-
child.execute().mapPartitionsInternal(_.map(_.copy())).takeOrdered(limit)(ord)
Review Comment:
No. The result does not match if it contains duplicate values. For example,
order by column a:
```
+---+---+
| a| b|
+---+---+
| 1| 1|
| 1| 2|
| 2| 3|
| 2| 4|
| 3| 5|
| 3| 6|
+---+---+
```
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