SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function finalizeAggregation (children 1)
     ExpressionList (children 1)
      Function CAST (children 1)
       ExpressionList (children 2)
        Function quantileState (children 2)
         ExpressionList (children 1)
          Function arrayJoin (children 1)
           ExpressionList (children 1)
            Literal Array_[UInt64_1, UInt64_2, UInt64_3]
         ExpressionList (children 1)
          Literal UInt64_0
        Literal \'AggregateFunction(quantile(1), UInt8)\'
