dongjoon-hyun commented on code in PR #39633:
URL: https://github.com/apache/spark/pull/39633#discussion_r1082084567
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sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala:
##########
@@ -1424,6 +1424,18 @@ object SQLConf {
.booleanConf
.createWithDefault(false)
+ val V2_BUCKETING_PARTIALLY_CLUSTERED_DISTRIBUTION_ENABLED =
+
buildConf("spark.sql.sources.v2.bucketing.partiallyClusteredDistribution.enabled")
+ .doc("During a storage-partitioned join, whether to allow input
partitions to be " +
+ "partially clustered, when both sides of the join are of
KeyGroupedPartitioning. At " +
+ "planning time, Spark will pick the side with less data size based
on table " +
+ "statistics, group and replicate them to match the other side.
This can help to " +
+ "reduce data skewness when certain partition values have large
amount of data. This " +
+ s"config requires both ${V2_BUCKETING_ENABLED.key} and " +
+ s"${V2_BUCKETING_PUSH_PART_VALUES_ENABLED.key} to be enabled")
Review Comment:
We need a version.
```scala
.version("3.4.0")
```
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