SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 2)
    Identifier name
    Identifier c
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (alias messages) (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 3)
          ExpressionList (children 2)
           Identifier user_id
           Function count (alias c) (children 1)
            ExpressionList
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             TableIdentifier messages
          ExpressionList (children 1)
           Identifier user_id
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier users
     TableJoin (children 1)
      Function equals (children 1)
       ExpressionList (children 2)
        Identifier messages.user_id
        Identifier users.id
   ExpressionList (children 2)
    OrderByElement (children 1)
     Identifier user_id
    OrderByElement (children 1)
     Identifier c
