Steve Horn <steve@stevehorn.cc> wrote:
> Execute the function: select * from geocode_carrier_route_by_geocode('xyz');
>
> This query takes 500 milliseconds to run. My question of course is why?
Wild guess:
The planner doesn't know the actual value of the input-parameter, so the
planner doesn't use the Index.
>
> Related: If I create a function and assign LANGUAGE 'sql', my function runs in
> the expected 10 milliseconds. Is there some overhead to using the plpgsql
> language?
The planner, in this case, knows the actual value.
>
> Thanks for any help in clarifying my understanding!
You can check the plan with the auto_explain - Extension, and you can
force the planner to create a plan based on the actual input-value by
using dynamic SQL (EXECUTE 'your query string' inside the function)
As i said, wild guess ...
Andreas
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