Github user vanzin commented on the issue: https://github.com/apache/spark/pull/14468 @rxin want to take a look since you added `VariableSubstitution`? Also @srowen since he looked at my previous patch. The depth config is not used anymore but I don't know if it's kosher to remove SQLConf constants; I saw some asserts in the code that I assume might be triggered by users. Also I assume that the circular reference check is enough so we don't need the depth check.
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