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 c
        Identifier d
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 1)
          ExpressionList (children 4)
           Literal UInt64_1 (alias a)
           Literal UInt64_2 (alias b)
           Literal UInt64_3 (alias c)
           Literal UInt64_4 (alias d)
