SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function arrayReduce (children 1)
     ExpressionList (children 2)
      Literal \'median\'
      Function array (children 1)
       ExpressionList (children 1)
        Function toDecimal64OrNull (children 1)
         ExpressionList (children 2)
          Literal \'1\'
          Literal UInt64_2
