SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function has (children 1)
     ExpressionList (children 2)
      Function array (children 1)
       ExpressionList (children 2)
        Function tuple (children 1)
         ExpressionList (children 2)
          Identifier a
          Identifier b
        Function tuple (children 1)
         ExpressionList (children 2)
          Identifier c
          Identifier d
      Function tuple (children 1)
       ExpressionList (children 2)
        Identifier b
        Identifier c
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 1)
          ExpressionList (children 4)
           Function materialize (alias a) (children 1)
            ExpressionList (children 1)
             Literal UInt64_1
           Literal UInt64_2 (alias b)
           Function materialize (alias c) (children 1)
            ExpressionList (children 1)
             Literal UInt64_3
           Literal UInt64_4 (alias d)