cloud-fan commented on a change in pull request #29726:
URL: https://github.com/apache/spark/pull/29726#discussion_r600540752
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/dynamicpruning/PartitionPruning.scala
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@@ -146,10 +150,17 @@ object PartitionPruning extends Rule[LogicalPlan] with
PredicateHelper {
case _ => fallbackRatio
}
+ val estimatePruningSideSize = filterRatio *
partPlan.stats.sizeInBytes.toFloat
// the pruning overhead is the total size in bytes of all scan relations
val overhead =
otherPlan.collectLeaves().map(_.stats.sizeInBytes).sum.toFloat
-
- filterRatio * partPlan.stats.sizeInBytes.toFloat > overhead.toFloat
+ if (canBuildBroadcast) {
+ estimatePruningSideSize > overhead
+ } else {
+ // We can't reuse the broadcast because the join type doesn't support
broadcast,
+ // and doing DPP means running an extra query that may have significant
overhead.
+ // We need to make the pruning side is very big so that DPP is still
worthy.
Review comment:
`make` -> `make sure`
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