Github user liancheng commented on a diff in the pull request:

    https://github.com/apache/spark/pull/6712#discussion_r32093509
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
 ---
    @@ -460,7 +460,7 @@ class Analyzer(
         def apply(plan: LogicalPlan): LogicalPlan = plan transform {
           case q: LogicalPlan =>
             q transformExpressions {
    -          case u @ UnresolvedFunction(name, children) if 
u.childrenResolved =>
    +          case u @ UnresolvedFunction(name, children) =>
    --- End diff --
    
    Mind to add a comment/example here to explain? The HAVING case isn't super 
intuitive to understand.


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