Re: Query is fast and function is slow

On Thu, 7 Dec 2006, Tom Lane wrote:

> Richard Ray <rray(at)mstc(dot)state(dot)ms(dot)us> writes:
>> On Thu, 7 Dec 2006, Thomas Pundt wrote:
>>> Just a guess: is the column "doc_num" really of type text? Maybe using "text"
>>> in the function lets the planner choose a sequential scan?
>
>> Actually "doc_num" is char(9)
>> I changed text to char(9) and got same slow results
>
> You need to make the second argument type "name", too, if you have a lot
> of users.

I said my knowledge was pitiful
Changing both parameters to char(9) and name fixed the problem
It appears to be using the index
If time allows could you explain this a bit

Thanks
Richard

>
> regards, tom lane
>
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