Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/17186#discussion_r105805970
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala ---
@@ -190,6 +190,15 @@ object SQLConf {
.booleanConf
.createWithDefault(false)
+ val CONSTRAINT_PROPAGATION_ENABLED =
buildConf("spark.sql.constraintPropagation.enabled")
+ .internal()
--- End diff --
Not sure about it, because constraint propagation is internal details.
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