Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/7334#discussion_r51973696
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/SparkStrategies.scala ---
@@ -337,8 +337,12 @@ private[sql] abstract class SparkStrategies extends
QueryPlanner[SparkPlan] {
execution.Sample(lb, ub, withReplacement, seed, planLater(child))
:: Nil
case logical.LocalRelation(output, data) =>
LocalTableScan(output, data) :: Nil
+ case logical.ReturnAnswer(logical.Limit(IntegerLiteral(limit),
child)) =>
+ execution.CollectLimit(limit, planLater(child)) :: Nil
case logical.Limit(IntegerLiteral(limit), child) =>
- execution.Limit(limit, planLater(child)) :: Nil
+ val perPartitionLimit = execution.LocalLimit(limit,
planLater(child))
--- End diff --
@JoshRosen Thank you for your explanation! That is so great that my
previous PR are useful. So far, I am unable to find more operators for limit
push down, except outer join and union all:
https://github.com/apache/spark/pull/10454 and
https://github.com/apache/spark/pull/10451
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