maropu commented on a change in pull request #29079:
URL: https://github.com/apache/spark/pull/29079#discussion_r454939944
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala
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@@ -2659,7 +2660,19 @@ object SQLConf {
buildConf("spark.sql.bucketing.coalesceBucketsInSortMergeJoin.maxBucketRatio")
.doc("The ratio of the number of two buckets being coalesced should be
less than or " +
"equal to this value for bucket coalescing to be applied. This
configuration only " +
- s"has an effect when
'${COALESCE_BUCKETS_IN_SORT_MERGE_JOIN_ENABLED.key}' is set to true.")
+ s"has an effect when '${COALESCE_BUCKETS_IN_JOIN_ENABLED.key}' is set
to true.")
+ .version("3.1.0")
+ .intConf
+ .checkValue(_ > 0, "The difference must be positive.")
+ .createWithDefault(4)
Review comment:
How about setting a smaller default value (e.g., 2?) than
`coalesceBucketsInSortMergeJoin.maxBucketRatio`?
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