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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