Islam Hegazy wrote:
Thanks for this information. It was really helpful.

Another problem that is facing me is altering existing functions. For example, what if I want to change the execution of the SUM function to work as follows:

select sum(a)
from mytable w(5);

which means to sum only 5 records or records that arrived in the last 5 minutes. Do I need to change the core code of PostgreSQL to implement such thing?

The first can be done with a limit clause, the second using a where clause on a timestamp column - there is no good case that I can see for either usage, not to mention the question of standards compatibility.



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