SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Identifier id
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier tab
   Function hasAllTokens (children 1)
    ExpressionList (children 2)
     Identifier message
     Function materialize (children 1)
      ExpressionList (children 1)
       Literal \'b\'
