SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function arrayReduce (children 1)
     ExpressionList (children 2)
      Function toNullable (children 1)
       ExpressionList (children 1)
        Literal \'median\'
      Function array (children 1)
       ExpressionList (children 2)
        Function toDecimal32OrNull (children 1)
         ExpressionList (children 2)
          Function toFixedString (children 1)
           ExpressionList (children 2)
            Literal \'1\'
            Literal UInt64_1
          Literal UInt64_2
        Literal UInt64_8
