Github user wzhfy commented on a diff in the pull request: https://github.com/apache/spark/pull/17286#discussion_r106602975 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala --- @@ -710,6 +710,14 @@ 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 + .checkValue(weight => weight >= 0 && weight <= 1, "The weight value must be in [0, 1].") + .createWithDefault(0.7) --- End diff -- `0.7` is just an empirical value, I think it's better to be able to tune it. Maybe mark it internal?
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