Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/16826#discussion_r101878697
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala
---
@@ -150,6 +152,9 @@ object EmptyFunctionRegistry extends FunctionRegistry {
throw new UnsupportedOperationException
}
+ override def copy: FunctionRegistry = {
+ throw new UnsupportedOperationException
--- End diff --
this ideally should be supported, and just returns itself.
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