SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function quantileTDigest (children 2)
     ExpressionList (children 1)
      Function arrayJoin (children 1)
       ExpressionList (children 1)
        Literal Array_[Int64_-1, Int64_-2, Int64_-3]
     ExpressionList (children 1)
      Literal Float64_0.5