Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/17241#discussion_r105750403
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala ---
@@ -555,6 +555,17 @@ object SQLConf {
.booleanConf
.createWithDefault(true)
+ val MAX_NESTED_VIEW_DEPTH =
+ buildConf("spark.sql.view.maxNestedViewDepth")
+ .internal()
+ .doc("The maximum level of view references allowed in a nested view.
A nested view may " +
+ "reference other nested views, the dependencies are organized in a
directed acyclic " +
+ "graph (DAG). However the DAG depth may grow really large and
cause unexpected " +
+ "behaviors, so we put some limit on this: when the nested level of
a view exceeds this " +
+ "value during view resolution, we terminate the resolution to
avoid further errors.")
+ .intConf
+ .createWithDefault(100)
--- End diff --
Add `.checkValue(...)`
What is the behaviors of edge scenarios? Does that mean we can disable view
support using this flag?
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