Github user mgaido91 commented on the issue: https://github.com/apache/spark/pull/19813 I am sorry, but I cannot give a precise answer. I can't think of any case where this can happen. There are many places where we assume that what we get is a literal or a variable name. But there may be some cases I am not aware of where this is not true. I think that making the proposed contract is the easiest thing to do. Otherwise we might have to revisit the whole code generation method.
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