SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function arrayUnion (children 1)
     ExpressionList (children 4)
      Literal Array_[UInt64_1]
      Literal Array_[Int64_-2]
      Literal Array_[Float64_1.1, \'hi\']
      Function array (children 1)
       ExpressionList (children 3)
        Literal NULL
        Literal \'hello\'
        Function array (children 1)
         ExpressionList