SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 4)
    Identifier key
    Identifier arr_x
    Identifier arr_y
    Identifier _table
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier test_in_tuple
    TablesInSelectQueryElement (children 1)
     ArrayJoin (children 1)
      ExpressionList (children 2)
       Identifier x (alias arr_x)
       Identifier y (alias arr_y)
   ExpressionList (children 3)
    OrderByElement (children 1)
     Identifier _table
    OrderByElement (children 1)
     Identifier arr_x
    OrderByElement (children 1)
     Identifier arr_y
