Github user hvanhovell commented on the pull request: https://github.com/apache/spark/pull/10957#issuecomment-175881244 @yhuai ```expr("last(r, true)")``` would return an ```UnresolvedFunction(UnresolvedAttribute(r), Literal(true))```. The problem is that the ```WindowSpec``` does not recognize ```UnresolvedFunction```'s. This is the cleaner fix. We could also add a match to the ```WindowSpec``` function for unresolved functions.
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