OdooV13 use order attr of search method with string field which contains integer

Question

I created custom field 'A' for sale.order table. field 'A' is defined as String in db. A values are numbers most of the time (eg. 50011) and sometimes default strings(eg. 'default'). I want to get top 10 A field numbers in a query. I wrote:
`recent_orders = request.env['sale.order'].sudo().search(
[('...')],
limit=10,
order='A desc')`
but it compares A data as strings. How can I make it compare them as integers and ignore string fields.

Rimvydas Kanapka · Accepted Answer

If default string is always 'default', you could try writing SQL query with cast function which converts value to your specified type:
result = self._cr.execute('select * from sale_order where A != 'default' order by cast(A as integer) desc limit 10')

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