SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 2)
    Function arrayPushBack (children 1)
     ExpressionList (children 2)
      Function array (children 1)
       ExpressionList
      Literal UInt64_1
    Function arrayPushFront (children 1)
     ExpressionList (children 2)
      Function array (children 1)
       ExpressionList (children 1)
        Function array (children 1)
         ExpressionList
      Function array (children 1)
       ExpressionList
