It is not a bug, as you probably know dal does not support fields aliases and
'_extra' is workaround. When do you get an error?
--
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/lis
In the book, sum of selects is described as:
Similarly, you can use the sum operator to add (sum) the values of a
specific field from a group of records. As in the case of count, the result
of a sum is retrieved via the storage object:
>>> sum = db.log.severity.sum()
>>> print db().select(sum).
2 matches
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