SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Asterisk
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 2)
          ExpressionList (children 2)
           Function materialize (alias s1) (children 1)
            ExpressionList (children 1)
             Literal \'1\'
           Function materialize (alias s2) (children 1)
            ExpressionList (children 1)
             Literal \'2\'
          ExpressionList (children 2)
           Identifier s1
           Identifier s2
   Function equals (children 1)
    ExpressionList (children 2)
     Identifier s2
     Literal \'2\'
