Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/17186#discussion_r105815354
--- 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 --
To determine whether a flag is internal or not, we should consider the
impact of external users. If users could easily hit this, we might need to
expose it as an external flag and document it in [the public
document](http://spark.apache.org/docs/latest/sql-programming-guide.html).
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