Github user wzhfy commented on a diff in the pull request:
https://github.com/apache/spark/pull/17286#discussion_r106357158
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala ---
@@ -696,6 +696,13 @@ object SQLConf {
.intConf
.createWithDefault(12)
+ val JOIN_REORDER_CARD_WEIGHT =
+ buildConf("spark.sql.cbo.joinReorder.card.weight")
+ .doc("The weight of cardinality (number of rows) for plan cost
comparison in join reorder: " +
+ "rows * weight + size * (1 - weight).")
+ .doubleConf
+ .createWithDefault(0.7)
--- End diff --
Yes, checking should be added, thanks!
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