dongjoon-hyun commented on code in PR #41094:
URL: https://github.com/apache/spark/pull/41094#discussion_r1195937039
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala:
##########
@@ -4199,6 +4199,16 @@ object SQLConf {
.booleanConf
.createWithDefault(false)
+ val LEGACY_IN_SUBQUERY_NULLABILITY =
+ buildConf("spark.sql.legacy.inSubqueryNullability")
+ .internal()
+ .doc(s"When set to false, IN subquery nullability is correctly
calculated based on " +
+ s"both the left and right sides of the IN. When set to true, restores
the legacy " +
+ "behavior that does not check the right side's nullability.")
+ .version("3.5.0")
+ .booleanConf
+ .createWithDefault(false)
Review Comment:
+100 for @cloud-fan 's holistic and complete solution.
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