Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/17186#discussion_r105818486
--- 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 --
Due to the fact there are few users reporting hitting this issue, we may
need to expose it as an external flag.
However, I would think that a large portion of external users may not know
constraint propagation. It might not be intuitive to link the problem they hit
to constraint propagation and to find this config, even it is external.
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