SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Identifier id
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier t1
   Function equals (children 1)
    ExpressionList (children 2)
     Function tuple (children 1)
      ExpressionList (children 2)
       Identifier s1
       Literal NULL
     Function CAST (children 1)
      ExpressionList (children 2)
       Subquery (children 1)
        SelectWithUnionQuery (children 1)
         ExpressionList (children 1)
          SelectQuery (children 3)
           ExpressionList (children 2)
            Identifier s1
            Identifier s2
           TablesInSelectQuery (children 1)
            TablesInSelectQueryElement (children 1)
             TableExpression (children 1)
              TableIdentifier t1
           Function and (children 1)
            ExpressionList (children 2)
             Function equals (children 1)
              ExpressionList (children 2)
               Identifier s1
               Literal \'e\'
             Function isNull (children 1)
              ExpressionList (children 1)
               Identifier s2
       Literal \'text\'
