SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 5)
   ExpressionList (children 3)
    Identifier attr
    Identifier _id
    Function arrayFilter (alias z) (children 1)
     ExpressionList (children 2)
      Function lambda (children 1)
       ExpressionList (children 2)
        Function tuple (children 1)
         ExpressionList (children 1)
          Identifier x
        Function in (children 1)
         ExpressionList (children 2)
          Identifier x
          Subquery (children 1)
           SelectWithUnionQuery (children 1)
            ExpressionList (children 1)
             SelectQuery (children 1)
              ExpressionList (children 1)
               Literal \'1\'
      Identifier attr_list
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier TESTTABLE
    TablesInSelectQueryElement (children 1)
     ArrayJoin (children 1)
      ExpressionList (children 1)
       Identifier z (alias attr)
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier _id
   Literal UInt64_3
   ExpressionList (children 1)
    Identifier attr
