HyukjinKwon commented on a change in pull request #28551:
URL: https://github.com/apache/spark/pull/28551#discussion_r426327344



##########
File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala
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@@ -251,7 +251,7 @@ object FunctionRegistry {
     expression[Log10]("log10"),
     expression[Log1p]("log1p"),
     expression[Log2]("log2"),
-    expression[Log]("ln"),
+    expression[Log]("ln", true),

Review comment:
       We should just directly override when it's possible because the tags are 
lost when it copies. That's defined in the parent node like that just to cover 
other general cases.




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