imback82 commented on a change in pull request #28123:
URL: https://github.com/apache/spark/pull/28123#discussion_r411825015
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala
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@@ -2574,6 +2574,27 @@ object SQLConf {
.booleanConf
.createWithDefault(false)
+ val COALESCE_BUCKET_IN_JOIN_ENABLED =
+ buildConf("spark.sql.bucketing.coalesceBucketInJoin.enabled")
+ .internal()
+ .doc("When true, if two bucketed tables with a different number of
buckets are joined, " +
+ "the side with a bigger number of buckets will be coalesced to have
the same number " +
+ "of buckets as the other side. This bucket coalescing can happen only
when the bigger " +
+ "number of buckets is divisible by the smaller number of buckets.")
+ .version("3.1.0")
+ .booleanConf
+ .createWithDefault(false)
+
+ val COALESCE_BUCKET_IN_JOIN_MAX_NUM_BUCKETS_DIFF =
+ buildConf("spark.sql.bucketing.coalesceBucketInJoin.maxNumBucketsDiff")
Review comment:
The reason I picked a diff is we could have ratio of 2, but the actual
difference could be large (e.g, 1000 / 500 => ratio of 2 but diff is 500).
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