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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