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 1)
           Function countDistinct (alias total_devtags) (children 1)
            ExpressionList (children 1)
             Identifier dev_tag
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             Subquery (alias t) (children 1)
              SelectWithUnionQuery (children 1)
               ExpressionList (children 1)
                SelectQuery (children 3)
                 ExpressionList (children 1)
                  Identifier dev_tag
                 TablesInSelectQuery (children 1)
                  TablesInSelectQueryElement (children 1)
                   TableExpression (children 1)
                    Subquery (alias t) (children 1)
                     SelectWithUnionQuery (children 1)
                      ExpressionList (children 1)
                       SelectQuery (children 2)
                        ExpressionList (children 1)
                         Asterisk
                        TablesInSelectQuery (children 1)
                         TablesInSelectQueryElement (children 1)
                          TableExpression (children 1)
                           TableIdentifier tags
                 ExpressionList (children 1)
                  Identifier dev_tag
   Set
